PURPOSE: To provide a fixing mechanism for fiting a supporter in which an object such as sensor or antenna is mounted on one end face of a PC card.

CONSTITUTION: This stsucture is constitutede of a supporter 1 mounting the electric parts such as sensor or antenna, a pair of sliders provided slidably at both the left and right side parts of the supporter 1. When sliders 3 provided with chip parts 3A provided integrally at the respective sliders, a pair of angular holes 2A provided on one end face of a PC card 2 to fix the supporter 1, a pair of metallic leaf springs 5 fixed to the supporter 1 so as to be extended along sliding directions A and B of the sliders and a pair of sliders 3 are respectively slid toward the PC card 2, the chip parts 3A of the sliders 3 and the leaf springs 5 are respectively tightly inserted into the respective angular holes 2A so that the supporter 1 can be tightly fixed to the one end of the PC card 2.