Replacement necessity determination device of the absorbing member, a signal output and a power generation unit power generation amount varies in accordance with the amount of liquid as well as power generation by the is absorbed into the absorbent member liquid contact, a detection signal corresponding to the power generation amount An output unit and a processing unit that acquires a parameter related to the amount of liquid based on the detection signal and determines whether or not the absorbing member needs to be replaced based on the parameter.吸収部材の交換要否判断装置は、吸収部材に吸収された液体が接することによって発電するとともに液体の量に応じて発電量が変化する発電部と、発電量に応じた検出信号を出力する信号出力部と、検出信号に基づいて液体の量に関するパラメータを取得するとともに、パラメータに基づいて吸収部材の交換の要否を判断する処理部とを備える。
