PURPOSE: To make a substrate guide rail to be fitted in every directions and ease its handling work by using a slide fixed-type fitting member, for example, a substrate guide rail in which a leg is slided after it is engaged with a slide hole part of a member to be fitted such as a chassis, etc., and a projecting member is fallen into a stopper hole part of the member t6 be fitted so as to fix the member to be fitted.

CONSTITUTION: Both end parts of a flexible member 1d provided with a projecting member 1f on the center thereof are fixed to a rigid member 1b extending between the both ends. Thus, even when a guide rail 1 is fitted against a member to be fitted 2 in every directions, the rail 1 can be prevented from moving (moving in right direction in (d)) in a direction for releasing the fixation.