Electrical connection box with a waterproof member

An electrical connection box, comprising:

• a connector-attached board provided with a circuit board and a connector fixed to the circuit board that engages with a mating connector;
• a waterproof member attached to the connector-attached board;
• and
• a case that internally houses the connector-attached board,
• wherein the case includes:
• a case top wall;
• and
• a case side wall that extends vertically from the case top wall, surrounds the circuit board, and has an opening portion formed on a bottom edge of the case side wall and configured to receive the waterproof member, wherein the waterproof member includes an engagement groove configured to receive a portion of the case side wall, and wherein the connector extends through the opening portion and is exposed to the outside of the case,
• the waterproof member is provided with a waterproof portion covering a periphery of an engagement surface of the connector facing the mating connector, and the waterproof portion is provided with a waterproof wall covering a periphery of the connector or the mating connector,
• the waterproof wall has an insertion opening into which the mating connector is inserted, and
• the waterproof member is provided with an erect wall that extends outward from an opening edge of the insertion opening with respect to the waterproof wall, and the erect wall is spaced apart from the case side wall and projects outward beyond the case top wall.