Module drive device

A module drive device, comprising:

• a movable-side member that includes a module holder configured to hold an optical module that includes a lens body, a substrate member, and an image sensor that is mounted on an upper surface of the substrate member so as to face the lens body in an optical axis direction;
• a fixed-side member mounted so as not to be movable relative to a heat dissipation member that dissipates heat generated by the image sensor;
• a driver that moves the movable-side member with respect to the fixed-side member by utilizing a plurality of shape-memory alloy wires provided between the fixed-side member and the movable-side member;
• and
• a biasing unit for biasing the module holder to a side of the heat dissipation member that faces a lower surface of the substrate member, wherein
• the biasing unit biases the module holder such that the substrate member and the heat dissipation member, which are separated from each other upon energization of the shape-memory alloy wire, are close to or in contact with contact each other upon de-energization of the shape-memory alloy wire.