A waterproof terminal structure includes a contact having a spring contact point, and a terminal member that holds the contact, the terminal member including a contact connection portion having conductivity and connected to the contact, a seal portion tightly attached to an insulating waterproof member disposed at least along a circumference of an opening of a housing, and a substrate mount portion having conductivity and connected to a wiring portion of a substrate, the contact connection portion and the substrate mount portion being electrically connected to each other and positioned such that a water entering path from the contact connection portion toward the substrate mount portion is cut by the seal portion, the contact not penetrating the terminal member.