To provide a radio transmission/reception system applicable to a radio communication toy, a wireless-controlled toy or the like, having an extremely simple constitution, and equipped with a function for grasping the directional relation between a radio transmitter and a radio receiver, and also to provide the radio receiver and the radio transmitter.

For example, when a user directs a casing 18 of this radio receiver 200 toward each direction around himself, a value of a comparison result by a receiving level comparator 10 is changed as the direction of the casing 18 of the radio receiver 200 approaches the azimuth wherein this radio transmitter 100 is installed, and a voice output or a visual output corresponding to the change is presented to the user by a receiving level information output device 12.