PURPOSE: To prevent slip off of a handle without using a part, e.g., an E-ring, by a method wherein an engaging mechanism capable of being inserted and removed only in a state to rotate a handle part to a position below a body is mounted to each of a mounting hole and a shaft part.

CONSTITUTION: A columnar shaft part 61a protruded inwardly is mounted to each of pivotally mounting parts 61 on both sides of a handle 60, and a fanshaped antislip piece 61b is formed on the tip side thereof. The antislip piece 61b is formed only on the handle part 62 side being the free end side of the handle 60. Meanwhile, a body 10 to which the handle is mounted has a mounting hole 14 formed in the upper end part of a side wall. The mounting hole 14 is formed in a composite shape in which a small part 14a through which only the shaft part 61a is capable of being inserted is formed on the upper side and a large part 14b through which the antislip piece 61b is capable of being inserted is formed on the lower side. Thus, the handle 60 can be assembled only in a state in which the handle part 62 is rotated to a position below the body 10. Through the working of an engaging mechanism, when the handle 60 is rotated in other direction than a direction to a position below the body 10, the handle 60 can not be removed from the body 10.