PURPOSE: To provide a table lamp which has a desired size for use and allows its size to be reduced for easy storage while it is out of use.

CONSTITUTION: A table lamp comprises a supporting pole 9 supporting a light source 6, supporting member 13, supporting ring 11, frame 12, flange 10, and supporting member 13. The member 16 is provided around the light source 6 and opens from one end to the other end to form a hood with an umbrella sheet. The supporting ring 11 and frame 12 are fixed to one end of the supporting pole 9 to support the member 16. The flange 10 is inserted into the supporting pole 9 and can slide in the axial direction of the supporting pole 9. The supporting member 13 connects the member 16 and flange 10. The table lamp comprises drive coils 1a, 1b of a shape memory alloy which expand or contract the flange 10 to move it in the axial direction of the supporting pole 9 and opens or closes the member 16 around its one end. In addition, the table lamp comprises an electric circuit which heats the drive coils 1a, 1b by applying electric currents to them.