To provide a connection structure and a connection method of a circuit board and a surface-mounting connector, in which the manufacturing cost can be reduced by facilitating insertion and extraction of a cable and by reducing component mounting process in the circuit board, and to provide a storage device having this connecting structure.

A through hole 111 is formed on an operation board 110 and a surface-mounting connector 120 is fixed, in a state of being engaged in the through hole 111 from the mounting face 110 side, and by applying a reflow solder treatment on the mounting face 110a, the surface-mounting connector 120 is connected to the operating board. Thereby, a plugging portion 123 of the connector can be arranged on the rear-face 110b side of the operating board 110, and soldering of the surface mounting connector 120 can be made by reflow solder treatment. As a result, component-mounting process in the operating board 110 is reduced, and manufacturing cost can be reduced.