A blood pressure manometer comprises a body and a separate display, and the body and separate display are provided with first and second communication parts, respectively. The first communication part has a light emitting element and is configured so that the element sends an infrared signal including blood pressure data. The second communication part has a light receiving element and is configured so that the light receiving element receives the infrared signal including the blood pressure data from the first communication part. The light emitting element is supported by the body to be opposite a subject even if a blood pressure measuring portion of the body measures the subject's blood pressure from any of the subject's left and right regions. The light receiving element is supported by the separate display to received the infrared signal which is sent from the light emitting element to be reflected on the subject.