A connector assembly comprises a first connector and a second connector configured to be mated with each other. The first connector includes a plurality of first contacts, a first housing and a first shell. The first contacts are arranged and retained in a pitch direction by the first housing The first housing is covered at least in part with the first shell The first shell includes a spring portion and a contact portion. The spring portion extends in the pitch direction. The spring portion is long in the pitch direction. The contact portion is supported by the spring portion so as to be movable in a direction perpendicular to the pitch direction. The second connector includes a second shell. The second shell is brought into contact with at least the contact portion of the first shell so that the first shell and the second shell are connected to each other when the second connector is mated with the first connector.