a first member that is configured to be fixed to a sensor, the first member having (i) a front surface, (ii) an opposing surface that is configured to face in a predetermined direction toward a mounted portion to which the sensor is mounted when the first member is fixed to the sensor, the opposing surface configured to be opposing the mounted portion when the first member is fixed to the sensor, (iii) a fluid inlet and (iv) a first fluid passage that is connected to the fluid inlet; and

a second member that is fixed to the front surface of the first member, the second member having a second fluid passage that is connected to the first fluid passage, and a spray port from which the fluid

that has passed through the second fluid passage is configured to be sprayed onto a predetermined location of the sensor, wherein

the first member has an attachment surface configured to be attached to an outer surface of the sensor,

the first member has a first pressing portion that projects from the opposing surface of the first member in the predetermined direction and extends toward the mounted portion to press against the mounted portion when the attachment surface of the first member is attached to the sensor, and

the first pressing portion has a thin portion that is thinner than other parts of the first pressing portion, the thin portion enabling the first pressing portion to be removed from the first member to change a distance between the opposing surface of the first member and the mounted portion when the attachment surface of the first member is attached to the sensor.