A main flexible substrate has a mount surface portion to be mounted to the rear surface of a base, and a movable surface portion extended from the mount surface portion. At a portion of the movable surface portion near the mount surface portion, there is provided an undulatable surface portion undulatable between a bent state of being bent relative to the mount surface portion and separate from the rear surface of the base and a flat state of being mated and mounted to the rear surface of the base. A first soldered terminal portion is formed on the front surface of the undulatable surface portion. A base end portion of a shutter flexible substrate extended to the rear side of the rear surface of the base and a base end portion of a coil flexible substrate are each provided with a second soldered terminal portion.