A liquid-proof connector includes a columnar terminal having a rectangular cross-sectional shape and a connector that includes a connector housing which is obtained through insert molding with the columnar terminal, is made of fiber-reinforced plastic in which fibers are oriented in a longitudinal direction of the columnar terminal, and has a terminal holding hole to which the columnar terminal is inserted and a fitting portion which fits to a counterpart terminal. An in-holding-hole insertion portion which is a portion being present within the terminal holding hole of the columnar terminal is fixed to the terminal holding hole in an airtight state by bringing a surface in close contact with an inner surface of the terminal holding hole. Tensile strength of the fiber-reinforced plastic in a direction perpendicular to the longitudinal direction is 45 MPa or more.