A radio communication method, comprising: a step in which a first radio communication device sends communication time reservation request information addressed to a second radio communication device, in which a time slot when data will be transmitted to the second radio communication device is written; a step in which the second radio communication device sends communication time reservation response information, in which notice of reception of the communication time reservation request information is added to the communication time reservation request information; a step in which the first radio communication device transmits data in the time slot of which the second radio communication device has been notified; a step in which the second radio communication device detects collisions while receiving data; a step in which a third radio communication device which has received the communication time reservation request information from the first radio communication device or the communication time reservation response information from the second radio communication device or both stores the time slot written in the communication time reservation request information or the communication time reservation response information as a transmission prohibited time slot; wherein notice of the time slot is given in the form of a data-transmission start time and a data-transmission dedicated time, a step in which the third radio communication device decides upon a time slot in which its own transmission and reception are possible, based on the stored transmission prohibited time slots, characterised by a step in which the second radio communication device gives notice of the collision to the first radio communication device when the number of collisions per unit time is more than or equal to a prescribed number of times; a step in which when the first radio communication device receives the notification of collision, it requests the second radio communication device to give the time slots in which transmission is prohibited or a time slot in which transmission is permitted; a step in which when the second radio communication device receives the request, it transmits, based on communication time reservation request information received from another radio communication device by the second radio communication device as a third radio communication device, the transmission prohibited time slots or a transmission-permitted time slot to the first radio communication device; and a step in which the first radio communication device selects a time slot which satisfies the conditions prescribed by the transmission prohibited time slots or the transmission-permitted time slot received from the second radio communication device and notifies the second radio communication device of the time slot as communication time reservation request information. a step in which a first radio communication device sends communication time reservation request information addressed to a second radio communication device, in which a time slot when data will be transmitted to the second radio communication device is written; a step in which the second radio communication device sends communication time reservation response information, in which notice of reception of the communication time reservation request information is added to the communication time reservation request information; a step in which the first radio communication device transmits data in the time slot of which the second radio communication device has been notified; a step in which the second radio communication device detects collisions while receiving data; a step in which a third radio communication device which has received the communication time reservation request information from the first radio communication device or the communication time reservation response information from the second radio communication device or both stores the time slot written in the communication time reservation request information or the communication time reservation response information as a transmission prohibited time slot; wherein notice of the time slot is given in the form of a data-transmission start time and a data-transmission dedicated time, a step in which the third radio communication device decides upon a time slot in which its own transmission and reception are possible, based on the stored transmission prohibited time slots, characterised by a step in which the second radio communication device gives notice of the collision to the first radio communication device when the number of collisions per unit time is more than or equal to a prescribed number of times; a step in which when the first radio communication device receives the notification of collision, it requests the second radio communication device to give the time slots in which transmission is prohibited or a time slot in which transmission is permitted; a step in which when the second radio communication device receives the request, it transmits, based on communication time reservation request information received from another radio communication device by the second radio communication device as a third radio communication device, the transmission prohibited time slots or a transmission-permitted time slot to the first radio communication device; and a step in which the first radio communication device selects a time slot which satisfies the conditions prescribed by the transmission prohibited time slots or the transmission-permitted time slot received from the second radio communication device and notifies the second radio communication device of the time slot as communication time reservation request information.