Rotation detecting device for detecting direction of rotation

A rotation detector, comprising:

• a first transmitting element and a second transmitting element each disposed opposite a gear rotor attached to a rotating body as a detected member;
• and
• a signal processing device connected to said first transmitting element and said second transmitting element for generating pulse signals based on rotation signals generated by said first transmitting element and said second transmitting element and transmitted to the signal processing device, wherein said signal processing device generates pulse signals with a first pulse width when said first transmitting element generates the rotation signal prior to said second transmitting element and generates pulse signals with a second pulse width greater than the first pulse width when the second transmitting element generates the rotation signal prior to said first transmitting element, whereby the signal processing device determines the rotational direction of the gear rotor by the order of the rotation signals generated by the first and second transmitting element and generates a pulse with different width depending on the rotational direction.