To reduce the cost by dispensing with a fastening member such as a screw to decrease the number of parts in a connector holder, and to facilitate detachment and attachment of a connector by dispensing with a tool.

The connector holders 60A, 60B are provided with clamping parts 62A, 62B, latch parts 64A, 64B, and finger hanging parts 65A, 65B. Connectors 38A, 38B for electrical connection are held between the clamping parts and brackets 37A, 37B as member to be fitted, and the latch parts are latched on the brackets, to thereby fit the connector to the brackets. At that time, the fingers are hung on the finger hanging parts to release latching of the latch parts.