A connector comprising: a contact to be electrically connected to a connection object; a main body (1, 2) holding the contact; and a shell covering the main body (1, 2); wherein the main body (1, 2) includes a first end portion on a side to which the connection object is connected, a second end portion opposite to the first end portion, a cover portion having lateral walls on the opposed sides thereof, a groove formed in each of the lateral walls in the form of a vertically elongate hole extending through from an outer side to an inner side of the respective lateral wall along a direction orthogonal to a connecting direction of the connection object, and a back face on a side of the second end portion; wherein the shell includes an upper portion covering an upper face of the cover portion, lateral walls covering the lateral walls of the cover portion and a back face portion covering the back face, characterized in that the shell includes lateral portions extending from respective lateral ends of the back face portion toward the side of the first end portion, each of the lateral portions having a projecting portion which projects to an inner side of the shell for engaging within the corresponding groove, the projecting portion being formed at an end of the lateral portion on the side of the first end portion, wherein each of the projection portions is formed like a plate-like projection piece with its surface being perpendicular to the connection direction, wherein the shell is fitted on the main body (1, 2) in the direction along which the grooves are formed, and wherein the projection portions are engaged into the respective grooves. a contact to be electrically connected to a connection object; a main body (1, 2) holding the contact; and a shell covering the main body (1, 2); wherein the main body (1, 2) includes a first end portion on a side to which the connection object is connected, a second end portion opposite to the first end portion, a cover portion having lateral walls on the opposed sides thereof, a groove formed in each of the lateral walls in the form of a vertically elongate hole extending through from an outer side to an inner side of the respective lateral wall along a direction orthogonal to a connecting direction of the connection object, and a back face on a side of the second end portion; wherein the shell includes an upper portion covering an upper face of the cover portion, lateral walls covering the lateral walls of the cover portion and a back face portion covering the back face, characterized in that the shell includes lateral portions extending from respective lateral ends of the back face portion toward the side of the first end portion, each of the lateral portions having a projecting portion which projects to an inner side of the shell for engaging within the corresponding groove, the projecting portion being formed at an end of the lateral portion on the side of the first end portion, wherein each of the projection portions is formed like a plate-like projection piece with its surface being perpendicular to the connection direction, wherein the shell is fitted on the main body (1, 2) in the direction along which the grooves are formed, and wherein the projection portions are engaged into the respective grooves.