Sensor attachment structure

A sensor attachment structure comprising:

• an oil pressure sensor including a sensor casing and a pressure detection element disposed in the sensor casing, the oil pressure sensor having a columnar shape and a central axis extending in an up-down direction;
• and
• a valve body including
• an upper body including an accommodation space into which the sensor casing is inserted upward along the central axis, and
• a lower body through which an oil passage extends toward the upper body,
• wherein the upper body includes a stopper that prevents downward movement of the oil pressure sensor along the central axis,
• wherein the sensor casing includes an engagement portion that is disposed at a surface thereof and that engages with the stopper to prevent downward movement of the sensor casing along the central axis and to retain the oil pressure sensor in the accommodation space, and
• wherein, in a state in which the sensor casing is disposed in the accommodation space, the engagement portion is elastically deformed toward the central axis, the engagement portion is in contact with the stopper, and downward movement of the sensor casing in a direction along the central axis is prevented.