A urine suction device improved to achieve quick urine which includes a urine receiver unit and a urine detector unit. The urine detector unit includes a pair of electrode assemblies adapted to output a detection signal as soon as it is wetted with urine. The pair of electrode assemblies is sandwiched between a liquid-pervious first sheet and a liquid-pervious second sheet. The first and second sheets are put flat and joined together along joint zones provided outside respective pairs of opposite side edges of the electrode assemblies. Along the respective joint zones, at least one of the first and second sheets has its thickness locally reduced and the first and second sheets are kept in close contact with each other along the joint zones and in the vicinity of the joint zones.
