A wireless communication device, comprising: a timer configured to output a first interrupt signal periodically; a communicator which includes a memory storing reception settings and is configured to, when receiving the first interrupt signal, perform intermittent reception for a wireless signal by use of the reception settings stored in the memory; and a controller configured to control the communicator, wherein: the communicator has two operation states including a normal mode allowed to receive the wireless signal and a sleep mode lower in power consumption than the normal mode, and is configured to, when receiving the first interrupt signal from the timer, start the normal mode, output contents of the received wireless signal to the controller and then start the sleep mode; the memory is configured to retain the reception settings even when the communicator starts the sleep mode; the controller is configured to write the reception settings to the memory at a time interval longer than a cycle at which the timer outputs the first interrupt signal; the controller is configured to write the reception settings to the memory and then proceed to a sleep mode; and the timer is provided separate from the controller. a timer configured to output a first interrupt signal periodically; a communicator which includes a memory storing reception settings and is configured to, when receiving the first interrupt signal, perform intermittent reception for a wireless signal by use of the reception settings stored in the memory; and a controller configured to control the communicator, wherein: the communicator has two operation states including a normal mode allowed to receive the wireless signal and a sleep mode lower in power consumption than the normal mode, and is configured to, when receiving the first interrupt signal from the timer, start the normal mode, output contents of the received wireless signal to the controller and then start the sleep mode; the memory is configured to retain the reception settings even when the communicator starts the sleep mode; the controller is configured to write the reception settings to the memory at a time interval longer than a cycle at which the timer outputs the first interrupt signal; the controller is configured to write the reception settings to the memory and then proceed to a sleep mode; and the timer is provided separate from the controller. the communicator has two operation states including a normal mode allowed to receive the wireless signal and a sleep mode lower in power consumption than the normal mode, and is configured to, when receiving the first interrupt signal from the timer, start the normal mode, output contents of the received wireless signal to the controller and then start the sleep mode; the memory is configured to retain the reception settings even when the communicator starts the sleep mode; the controller is configured to write the reception settings to the memory at a time interval longer than a cycle at which the timer outputs the first interrupt signal; the controller is configured to write the reception settings to the memory and then proceed to a sleep mode; and the timer is provided separate from the controller.