A connector coupling structure that, when an electronic device is inserted into a holder device, electrically connects a connector terminal of a first connector provided in the electronic device and a connector terminal of a second connector provided in the holder device, the connector coupling structure characterized in that the holder device includes a holder body into which the electronic device is inserted, and a connector body provided with the second connector is shiftably attached to the holder body, the first connector is provided with a guide portion that guides the second connector such that the connector terminal of the second connector aligns with the connector terminal of the first connector, the second connector is provided with a guided portion that is guided by the guide portion when the second connector is shifted, and the connector body, when a center position of a mobile area of the connector body with respect to the holder body is set as a reference position, is attached to the holder body shiftable, within a range that the second connector can follow the first connector shifted with respect to the reference position in a direction that intersects an insertion direction of the electronic device, and within a range that the guided portion can be guided by the guide portion, the connector coupling structure characterized in that a sum total of a first shift amount that the first connector can be shifted with respect to the reference position in the direction that intersects the insertion direction of the electronic device and a second shift amount that the second connector can be shifted with respect to the reference position in the same direction is smaller than a guidance amount that the guide portion moves the guided portion in the same direction during insertion of the electronic device into the holder body, and the second shift amount is larger than the first shift amount. the holder device includes a holder body into which the electronic device is inserted, and a connector body provided with the second connector is shiftably attached to the holder body, the first connector is provided with a guide portion that guides the second connector such that the connector terminal of the second connector aligns with the connector terminal of the first connector, the second connector is provided with a guided portion that is guided by the guide portion when the second connector is shifted, and the connector body, when a center position of a mobile area of the connector body with respect to the holder body is set as a reference position, is attached to the holder body shiftable, within a range that the second connector can follow the first connector shifted with respect to the reference position in a direction that intersects an insertion direction of the electronic device, and within a range that the guided portion can be guided by the guide portion, the connector coupling structure characterized in that a sum total of a first shift amount that the first connector can be shifted with respect to the reference position in the direction that intersects the insertion direction of the electronic device and a second shift amount that the second connector can be shifted with respect to the reference position in the same direction is smaller than a guidance amount that the guide portion moves the guided portion in the same direction during insertion of the electronic device into the holder body, and the second shift amount is larger than the first shift amount.