A pulse wave detecting device in which the motion of the hand in a state where the detector is attached to the wrist can be prevented from being impeded, and which can accurately detect a pulse wave is provided. A biological information measuring device 100 includes: a housing 20 which accommodates a pulse wave detection sensor for detecting a pulse wave from the radial artery TD, and which is configured to be able to be wound along the circumferential direction X of the wrist H； and a band 30 which is used for fixing the housing 20 to the wrist, and which is lower in rigidity than the housing 20. The housing 20 is configured by: a back-side portion 2a which is to be wound around the back side of the hand； a palm side portion 2b which is to be wound around a palm side of the hand； and a coupling portion 2c which connects them together. In a state where the housing 20 is attached to the wrist H, the whole of a part which is in a hand side end portion 20a of the housing 20 that is on the side of the hand of the subject in a direction Y perpendicular to the circumferential direction X, and which constitutes the back-side portion 2a is closer to the side of the arm of the subject than the part constituting the palm side portion 2b in the direction Y.
