Connector, mating connector, and connector assembly

A connector to be fitted to a mating connector, the connector comprising:

• a housing including a peripheral wall, the peripheral wall including
• a first end wall and a second end wall facing each other in a first axis,
• a first side wall coupling one end of the first end wall and one end of the second end wall, and
• a second side wall coupling an other end of the first end wall and an other end of the second end wall;
• a holding metal fitting disposed at, out of a first end of the peripheral wall in the first axis and a second end opposite to the first end, the first end;
• and
• a terminal held by the peripheral wall and electrically connected to a mating terminal of the mating connector,
• wherein the connector is fitted to the mating connector when the connector moves upward,
• the holding metal fitting includes:
• an end piece including an upper part disposed above the first end wall and an inner part disposed inside the first end wall;
• a side piece including an upper part disposed above the first side wall and an inner part disposed inside the first side wall;
• a coupling part disposed at a corner of the peripheral wall where the first end wall and the first side wall are connected to each other, the coupling part coupling the end piece and the side piece to each other;
• a bottom located between the first side wall and the second side wall, the bottom extending from a lower end of the end piece or a lower end of the side piece;
• and
• a spring piece extending upward from the bottom, and
• the coupling part includes an inner coupling part connecting the inner part of the end piece and the inner part of the side piece without discontinuities.