A body surface temperature measurement device capable of appropriately performing measurement of a body surface temperature of an animal is realized. A body surface temperature measurement device includes a temperature sensing unit including an infrared ray detection sensor and a cover that covers the infrared ray detection sensor, in which the cover closely contacts a body surface of the animal and at least a part of a contact surface of the cover, which contacts the body surface of the animal, is formed into a curved surface that bulges toward a body surface side of the animal.
