To reduce cost by obviating the need of nonslip work (post-process) for preventing the coming off of a slope member 5 after being mounted to a housing 3 without using an expensive resin material (synthetic resin small in the amount of deformation due to high-temperature creep or the like).

Only by inserting a slope body 6 of the slope member 5 into the housing 3, and pressing a pair of first and second press-in parts 31 and 32 of the slope member 5 into press-in surfaces of a pair of first and second press-in holding parts 41 and 42 of the housing 3 at the same time, fixation work of the slope member 5 to the housing 3 and the nonslip work of the slope member 5 from the housing 3 can be completed at the same time. Thereby, the need of a post-process for the nonslip of the slope member 5 after being mounted in the housing 3 is obviated without an expensive resin material, whereby improvement of efficiency of attachment work of the slope member 5 to the housing 3 and cost reduction can be achieved.

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