A heartbeat measuring apparatus includes an biological information acquiring unit that acquires biological information derived from heartbeats, pulses or the like of a user; a body-movement detecting unit that detects a body movement of the user; a reference information generating unit that generates reference information, which serves as a reference indicating the heartbeats or pulses for comparison, based upon the biological information acquired by the biological information acquiring unit after completion of a detection of the body movement; a waveform similarity calculating unit that calculates a waveform similarity between the reference information and biological information acquired after the reference information is generated; an extreme value acquiring unit that specifies an extreme value of the heartbeats or pulses from a plurality of waveform similarities, and acquires extreme value time at which the extreme value is obtained; and an biological information analyzing unit that analyzes biological information of the user based upon a time interval between the extreme value times, to obtain desired information.