A menstrual cycle monitoring apparatus 100 that determines a menstrual cycle of a user is composed of: a clock unit 103 that measures a usage quantity (i.e., a cleansing time period taken from when a bidet switch 111 is pressed to when a stop switch 113 is pressed) of the bidet apparatus 116 that cleanses the vaginal area; a memory unit 104 that accumulates a history of the measured usage quantity for each date; and a menstrual cycle determining unit 105 that determines the menstrual cycle of the user on the basis of the history of the usage quantity accumulated in the memory unit 104. 展开▼
