A thermometer (1) includes a probe (2) to be fitted into an ear (100) of a patient, the probe having an infrared sensor (10) for measuring the temperature of an eardrum (105) of the ear (100) of the patient in a non-contact manner, a signal cable (20) connected to the infrared sensor (10) and drawn out of the probe (2), a gripping part (45) provided in the probe (2) to be gripped when the probe (2) is inserted inside a tragus (108) of the ear (100), and a groove portion (40) provided in the gripping part (45) to hold the signal cable (20) in a curved state and to allow a curved portion (20R) of the signal cable (20) to fit in and along a cavum conchae (109) of the ear (100).
