A floating connector configured to constitute a part of a floating connector assembly including a first connector electrically connectable to a first equipment, a second connector electrically connectable to a second equipment, and a relay connector inserted into the first connector and also insertable into the second connector to electrically connect the first connector and the second connector, wherein the floating connector includes the relay connector and the first connector, the relay connector includes a first terminal having a plurality of contact spring parts arranged at intervals in a circumferential direction of the first terminal, the first connector includes a second terminal where a tubular part is formed, the tubular part having a spherical part on an inner periphery thereof, the plurality of contact spring parts come into contact with the spherical part in a state of being inserted into the tubular part of the second terminal, when the relay connector rotates with respect to the first connector, a distance from the center of the spherical part to a contact part between each of the contact spring parts and the spherical part of the second terminal is the same; the first connector includes a retaining member disposed inside the tubular part of the second terminal and having a spherical part being concave to an opposite side to the relay connector side in a state where the first connector and the relay connector are electrically connected, the relay connector includes a holding member configured to hold the first terminal and having a spherical part being convex to the first connector side in the state where the first connector and the relay connector are electrically connected, and the spherical part of the retaining member of the first connector and the spherical part of the holding member of the relay connector are in spherical contact, and a center of a spherical contact part between the spherical part of the retaining member of the first connector and the spherical part of the holding member of the relay connector coincides with a center of the spherical part of the second terminal of the first connector. the floating connector includes the relay connector and the first connector, the relay connector includes a first terminal having a plurality of contact spring parts arranged at intervals in a circumferential direction of the first terminal, the first connector includes a second terminal where a tubular part is formed, the tubular part having a spherical part on an inner periphery thereof, the plurality of contact spring parts come into contact with the spherical part in a state of being inserted into the tubular part of the second terminal, when the relay connector rotates with respect to the first connector, a distance from the center of the spherical part to a contact part between each of the contact spring parts and the spherical part of the second terminal is the same; the first connector includes a retaining member disposed inside the tubular part of the second terminal and having a spherical part being concave to an opposite side to the relay connector side in a state where the first connector and the relay connector are electrically connected, the relay connector includes a holding member configured to hold the first terminal and having a spherical part being convex to the first connector side in the state where the first connector and the relay connector are electrically connected, and the spherical part of the retaining member of the first connector and the spherical part of the holding member of the relay connector are in spherical contact, and a center of a spherical contact part between the spherical part of the retaining member of the first connector and the spherical part of the holding member of the relay connector coincides with a center of the spherical part of the second terminal of the first connector.