Offer of the liquid level measurement system which possesses the liquid retention container and, relatively the simple structure has the sensor which perceives the fact that the liquid of the allowance is accommodated in order which to measure that liquid level. Liquid retention container 13 of the sensor attachment which includes with the sensor structure 12 in order to measure the accommodation quantity of the liquid 40 which is accommodated in the container itself 11 which generates electricity the container itself which has the introduction section where the liquid penetrates from outside with 11 and liquid 40.所要量の液体が収容されたことを感知するセンサを備える液体保持容器と、その液量を測量するための、比較的に簡易な構造を有する液量測定システムの提供。外部から液体が進入する導入部を備える容器本体11と、液体40によって発電する容器本体11に収容された液体40の収容量を測定するためのセンサ構造体12とを含むセンサ付きの液体保持容器13。
