Abstract: This contact apparatus includes: a fixed contact; a movable contactor including a movable contact facing the fixed contact; a magnetic shield configured to move in conjunction with the movable contactor and including a first shield portion, a second shield portion, and a joining portion joining the first shield portion and the second shield portion together; and a magnet having a first surface facing the fixed contact, the movable contact, and the first shield portion. The fixed contact, the movable contact, and the first shield portion are arranged in the following order: the fixed contact; the movable contact; and the first shield portion. The first shield portion includes a protrusion extending along the first surface of the magnet.

Abstract: A waterproof cover that is configured to be connected to an external member of a protection tube that protects an electric wire, the waterproof cover including a wall; a ventilation through which air can pass, wherein: the ventilation includes a pair of contact surfaces that are provided penetrating the wall and are in contact with each other, and the pair of contact surfaces are configured to separate from each other due to the ventilation deforming based on a difference occurring between an internal pressure and an external pressure of the protection tube, and the ventilation is formed integrated with the wall; and a body surrounding the ventilation, wherein a thickness of the body is larger than a thickness of the wall located outside the body.

Abstract: A waterproof cover that is configured to be connected to an external member of a protection tube that protects an electric wire, the waterproof cover including a wall; a ventilation through which air can pass, wherein: the ventilation includes a pair of contact surfaces that are provided penetrating the wall and are in contact with each other, and the pair of contact surfaces are configured to separate from each other due to the ventilation deforming based on a difference occurring between an internal pressure and an external pressure of the protection tube, and the ventilation is formed integrated with the wall; and a body surrounding the ventilation, wherein a thickness of the body is larger than a thickness of the wall located outside the body.