Patent ID: 8250680

Claim:
A urinal comprising: a urinal body; a high-frequency sensor which radiates a radio beam obliquely passing through an upper surface of the urinal body toward a bowl and receives a reflected wave from an object so as to generate a detection signal; and a valve which discharges or stops flushing water to the urinal body in response to the detection signal, wherein an angle formed between a first plane including the upper surface of the urinal body and a second plane including a radiation surface of an antenna of the high-frequency sensor is in a range of more than 0 degree to less than 90 degree, wherein a cross line where the first plane and the second plane intersect with each other is substantially parallel to a horizontal direction of the urinal body, wherein the radio beam is a linearly-polarized wave, wherein an excitation direction of the radio beam intersects with the cross line, and wherein an intersect angle between the excitation direction and the cross line is set such that an intensity of the radio beam passing through the upper surface of the urinal body is larger than that of the radio beam reflected by the upper surface.