A power transmission device, comprising: a communication unit that transmits a power capability information transmission request via a communication channel and receives power capability information in response to the power capability information transmission request; a processing unit configured to set a parameter based on the power capability information; and a power transmission unit that wirelessly transmits power using the parameter to a power reception device, wherein the communication unit transmits the power capability information transmission request before the power transmission unit wirelessly transmits the power, wherein the communication unit receives first power reception amount information for the parameter after transmitting the power, characterized in that the processing unit is configured to calculate a first power transmission efficiency based on the first power reception amount information and to generate parameter information excluding the parameter if the first power transmission efficiency is less than a predetermined value, wherein, if the communication unit receives second power reception amount information for the parameter, the processing unit calculates a second power transmission efficiency based on the second power reception amount information, and, if the second power transmission efficiency is less than the predetermined value a predetermined number of times in a predetermined period corresponding to the first power reception amount information and the second power reception amount information, the processing unit excludes the parameter from the parameter information, said parameter information indicating parameters of power to be sequentially transmitted in a power transmission period for every power transmission period on the basis of set parameter candidates of the power, said parameter information being sequentially transmitted to the power reception device. a communication unit that transmits a power capability information transmission request via a communication channel and receives power capability information in response to the power capability information transmission request; a processing unit configured to set a parameter based on the power capability information; and a power transmission unit that wirelessly transmits power using the parameter to a power reception device, wherein the communication unit transmits the power capability information transmission request before the power transmission unit wirelessly transmits the power, wherein the communication unit receives first power reception amount information for the parameter after transmitting the power, characterized in that the processing unit is configured to calculate a first power transmission efficiency based on the first power reception amount information and to generate parameter information excluding the parameter if the first power transmission efficiency is less than a predetermined value, wherein, if the communication unit receives second power reception amount information for the parameter, the processing unit calculates a second power transmission efficiency based on the second power reception amount information, and, if the second power transmission efficiency is less than the predetermined value a predetermined number of times in a predetermined period corresponding to the first power reception amount information and the second power reception amount information, the processing unit excludes the parameter from the parameter information, said parameter information indicating parameters of power to be sequentially transmitted in a power transmission period for every power transmission period on the basis of set parameter candidates of the power, said parameter information being sequentially transmitted to the power reception device.