To reduce an effect of reflected light from a layer other than a layer to be read upon focus position control when reading a multilayer optical disk in an optical disk drive. Each linkage has a pair of rockers which are articulately coupled at first ends to an intermediate part such that the linkages are orthogonally to one another. sound into an electrical signal. The elastic unit is compressed directly or indirectly by the port so as to accumulate elastic potential energy while the port chip is getting closer to the receptacle chip. The two securing members secure the resilient component to the cable, the resilient component is elastically deformable between a first state, in which the resilient component and the cable are contracted, and a second state, in which the resilient component and the cable are extended.