A harness component according to one aspect of the present disclosure is an electrical connection box, and a harness fixing piece included in a housing of the electrical connection box includes a first wall portion that extends in a length direction of a wire harness, the wire harness being arranged on an inner surface of the first wall portion; a second wall portion that is arranged outside of a lower end, which is an end portion of the first wall portion in a length direction of the wire harness, and is continuous along a lower end; and a bottom portion that extends outward from the lower end of the first wall portion and supports the second wall portion away from the outer surface of the first wall portion.