A sensor mounting may include an accommodation unit; a sensor case; and a screw member. A flow passage body may include the accommodation unit, and a flow passage opening. The fluid pressure sensor may include a sensor main body, and the sensor case. The sensor case may include a sensing hole. The sensor case may include a columnar portion disposed along a center axis, and a flange portion which protrudes from the columnar portion. The accommodation unit may include a female screw provided in a radially inside surface of the accommodation unit. The screw member may include the screw member may include a hole portion, and a male screw. The screw member may be disposed to be opposed to an upper side of the flange portion.