To provide a pedometer with a clock function with which past information of the number of steps can be selectively erased.

The pedometer comprises: the pedometer 1 with a clock function; a clocking means 32; the number of steps counting means 40 for detecting walking of a user to count the number of steps; the past number of steps data storing means 35 and 24 for storing the number of steps data F of the number of steps counting means 40 as the past number of steps data of a prescribed period each time the clocking means 32 clocks the elapse of the period; and an erasing means 70 for selectively erasing the past data Fi stored in the past data storing part 24 of the past number of steps data storing means 35 and 24.