A contact structure unit that achieves electrical continuity between a substrate, which includes a plurality of electrodes, and a contact object includes a first-type contact-carrying member including a contact portion which makes contact with the contact object; includes a plurality of second-type contact-carrying members each of which includes a leading end portion formed at one end portion and making contact with the electrodes and each of which makes contact with the first-type contact-carrying member at the other end portion; and includes a plurality of coil springs each of which is disposed between the contact portion and the leading end portions and each of which biases the contact portion and the leading end portions.