A light guiding device, comprising a light guide plate, the light guide plate including: a transparent main body part which can transmit light inputted from a light source; wherein a diffusely reflecting part is provided on a lower surface side of the transparent main body part, and wherein a light emitting planar part which corresponds to a first light emitting part is provided on an upper surface side of the transparent main body part; characterised in that the light guide plate further comprises: a protruding part which is provided so as to protrude from a part of an end surface of the transparent main body part; wherein reflecting parts are provided on a portion of the end surface of the transparent main body part on which the protruding part is not provided and on an upper surface side, a lower surface side, and both side surface sides of the protruding part, and a light emitting end part which corresponds to a second light emitting part is provided at a leading end of the protruding part, wherein the light guide plate includes a light entrance part through which the light is inputted from the light source disposed on the lower surface side of the transparent main body part, and wherein the transparent main body part includes a light direction change part which changes a direction of the light which has entered through the light entrance part toward the light emitting end part. a transparent main body part which can transmit light inputted from a light source; wherein a diffusely reflecting part is provided on a lower surface side of the transparent main body part, and wherein a light emitting planar part which corresponds to a first light emitting part is provided on an upper surface side of the transparent main body part; characterised in that the light guide plate further comprises: a protruding part which is provided so as to protrude from a part of an end surface of the transparent main body part; wherein reflecting parts are provided on a portion of the end surface of the transparent main body part on which the protruding part is not provided and on an upper surface side, a lower surface side, and both side surface sides of the protruding part, and a light emitting end part which corresponds to a second light emitting part is provided at a leading end of the protruding part, wherein the light guide plate includes a light entrance part through which the light is inputted from the light source disposed on the lower surface side of the transparent main body part, and wherein the transparent main body part includes a light direction change part which changes a direction of the light which has entered through the light entrance part toward the light emitting end part. a protruding part which is provided so as to protrude from a part of an end surface of the transparent main body part; wherein reflecting parts are provided on a portion of the end surface of the transparent main body part on which the protruding part is not provided and on an upper surface side, a lower surface side, and both side surface sides of the protruding part, and a light emitting end part which corresponds to a second light emitting part is provided at a leading end of the protruding part, wherein the light guide plate includes a light entrance part through which the light is inputted from the light source disposed on the lower surface side of the transparent main body part, and wherein the transparent main body part includes a light direction change part which changes a direction of the light which has entered through the light entrance part toward the light emitting end part.