A power meter includes a first measurement unit 7 that measures a force applied to a first pedal B322 and calculates predetermined first information (power and/or torque) on the first pedal B322, and a second measurement unit 6 that measures a force applied to a second pedal B321 and calculates second information (power and/or torque) on the second pedal B321, which is the same kind of the first information. The first measurement unit 7 transmits first information data indicating the first information to the second measurement unit 6, and the second measurement unit 6 adds the first information to the second measurement information and transmits an added value data indicating an added value obtained by adding the first information to the second information.