To provide a breather cover which can suppress the number of components and facilitate insertion work of a breather hose to a breather cover side.SOLUTION: A cover inner peripheral face 24 of a cover body part 12 is formed of: a rear face 25 of a front plate part 16; a vehicle width direction inside face of an outer plate part 18; and a front face 27 of a rear plate part 20, and partitions an inner space 14. The rear face 25 of the front plate part 16 and the front face 27 of the rear plate part 20 extend from an upper end opening 22 to a lower end opening 23 and come close to each other as advancing downward. A separation distance L3 between the rear face 25 of the front plate part 16 and the front face 27 of the rear plate part 20 on the lower end opening 23 is shorter than an outer diameter D of a breather hose 8. The other end 8b of the breather hose 8 contacts the rear face 25 of the front plate part 16 and the front face 27 of the rear plate part 20, on a prescribed height position 28. The inner space 14 has a hose insertion space 14a into which the breather hose 8 is inserted, and a hose non-insertion space 14b into which the breather hose 8 is not inserted.SELECTED DRAWING: Figure 4