To provide a sensor device for preventing a burden from being given to a patient, or the like as much as possible, by precisely measuring a local part in a body by reaching even a minute part in the body with a simple and compact configuration.

The sensor device 10 comprises a slender support member 11; an optical fiber 12 buried along the longitudinal direction in the support member; and an optical fiber type pressure sensor 13 comprising a diaphragm 13a mounted to the tip end face of the optical fiber while the periphery is adhered so that internal space can be demarcated, and a reflection layer 13b provided on the inner surface of the diaphragm. A window section 11b for exposing the pressure sensor sideways is provided on the outer surface corresponding to the pressure sensor of the support member.