A housing case for a fusion splicer which is for housing the fusion splicer for an optical fiber, comprising: a case main body including a first side wall; and a lid body attached to the case main body to be openable and closable and including a second side wall configured to match the first side wall when closed, wherein at least one of the first side wall and the second side wall includes an insertion portion configured for a cable extending from the inside of the housing case to the outside thereof to be inserted through the insertion portion in a state where the lid body is closed with respect to the case main body, characterized in that: the first side wall includes a first edge portion, the second side wall includes a second edge portion, and the first edge portion and the second edge portion come into contact with each other when the lid body is closed with respect to the case main body, the insertion portion includes a first case notch provided in the first edge portion and a second case notch provided in the second edge portion, and the housing case further comprises: a first sealing member provided in the first edge portion; and a second sealing member provided in the second edge portion, wherein the first sealing member and the second sealing member are configured to seal a gap between the first case notch, the second case notch, and the cable when the lid body is closed with respect to the case main body, wherein the first sealing member is located outside the first case notch, and the second sealing member is located inside the second case notch, and wherein the first sealing member and the second sealing member are configured such that the cable is sandwiched therebetween in a thickness direction of the housing case when the lid body is closed with respect to the case main body. a case main body including a first side wall; and a lid body attached to the case main body to be openable and closable and including a second side wall configured to match the first side wall when closed, wherein at least one of the first side wall and the second side wall includes an insertion portion configured for a cable extending from the inside of the housing case to the outside thereof to be inserted through the insertion portion in a state where the lid body is closed with respect to the case main body, characterized in that: the first side wall includes a first edge portion, the second side wall includes a second edge portion, and the first edge portion and the second edge portion come into contact with each other when the lid body is closed with respect to the case main body, the insertion portion includes a first case notch provided in the first edge portion and a second case notch provided in the second edge portion, and the housing case further comprises: a first sealing member provided in the first edge portion; and a second sealing member provided in the second edge portion, wherein the first sealing member and the second sealing member are configured to seal a gap between the first case notch, the second case notch, and the cable when the lid body is closed with respect to the case main body, wherein the first sealing member is located outside the first case notch, and the second sealing member is located inside the second case notch, and wherein the first sealing member and the second sealing member are configured such that the cable is sandwiched therebetween in a thickness direction of the housing case when the lid body is closed with respect to the case main body. the first side wall includes a first edge portion, the second side wall includes a second edge portion, and the first edge portion and the second edge portion come into contact with each other when the lid body is closed with respect to the case main body, the insertion portion includes a first case notch provided in the first edge portion and a second case notch provided in the second edge portion, and the housing case further comprises: a first sealing member provided in the first edge portion; and a second sealing member provided in the second edge portion, wherein the first sealing member and the second sealing member are configured to seal a gap between the first case notch, the second case notch, and the cable when the lid body is closed with respect to the case main body, wherein the first sealing member is located outside the first case notch, and the second sealing member is located inside the second case notch, and wherein the first sealing member and the second sealing member are configured such that the cable is sandwiched therebetween in a thickness direction of the housing case when the lid body is closed with respect to the case main body. a first sealing member provided in the first edge portion; and a second sealing member provided in the second edge portion, wherein the first sealing member and the second sealing member are configured to seal a gap between the first case notch, the second case notch, and the cable when the lid body is closed with respect to the case main body, wherein the first sealing member is located outside the first case notch, and the second sealing member is located inside the second case notch, and wherein the first sealing member and the second sealing member are configured such that the cable is sandwiched therebetween in a thickness direction of the housing case when the lid body is closed with respect to the case main body.