Patent ID: 7178968

Claim:
A surface light source device, comprising: a light source section which has a light emitting face; an optical panel which is arranged so as to cover the light emitting face of the light source section and which performs a predetermined optical operation for light from the light source section; and at least one frame which includes a front face portion arranged so as to overlap with a peripheral portion of the optical panel in a direction of a thickness of the optical panel and a side face portion extending from an outer periphery of the front face portion toward the light source section and which is arranged along a peripheral portion of the light emitting face of the light source section; wherein the at least one frame is composed of a plurality of divisional members divided in a direction along the peripheral portion of the light emitting face of the light source section, which have a slit between each divisional member, and a light shielding portion is provided, at each said slit in the front face portion of the frame, for preventing light of the light source section from leaking through each said slit, wherein the divisional members include a u-shaped member, and wherein the corner portion of the u-shaped member is formed by drawing.