Disclosed herein is an electrical connector sealing member. The present invention relates to a rubber composition for a tire, comprising: silica; a silane coupling agent; and at least one selected from the group consisting of a hydroxy acid, itaconic acid, and a salt thereof. A wall of the housing surrounding the terminal fittings is constructed of a thin part forward from a midway position in a longitudinal direction of the housing and of a thick part thicker than the thin part and rearward from the midway position. The aspheric lens is mounted to the first and second inclined surfaces and has a part thereof protruding in the slit.