A light source device comprising: a first light source section and a second light source section configured to emit light along two different directions; and a light combining member configured to combine the light emitted from the first light source section with the light emitted from the second light source section; characterized in that the light source device further comprises a light source casing to which the first light source section and the second light source section are attached outside; a holding member configured to hold the light combining member, the holding member accommodated inside the light source casing, and a condensing lens configured to condense the light combined together by the light combining member, wherein the holding member is fixed inside the light source casing, the first light source section has a first light emission area and a second light emission area which are arranged at a first interval along a first direction, the second light source section has a third light emission area and a fourth light emission area which are arranged at the first interval along the first direction, the condensing lens has a first aspheric lens on which light emitted from the first light emission area and the light emitted from the third light emission area become incident, a second aspheric lens on which light emitted from the second light emission area and the light emitted from the fourth light emitted area become incident, the first aspheric lens and the second aspheric lens are arranged at a second interval along the first direction, and the first and the second light source sections and the first and the second aspheric lenses are arranged in such way that the first interval and the second interval correspond to each other. a first light source section and a second light source section configured to emit light along two different directions; and a light combining member configured to combine the light emitted from the first light source section with the light emitted from the second light source section; characterized in that the light source device further comprises a light source casing to which the first light source section and the second light source section are attached outside; a holding member configured to hold the light combining member, the holding member accommodated inside the light source casing, and a condensing lens configured to condense the light combined together by the light combining member, wherein the holding member is fixed inside the light source casing, the first light source section has a first light emission area and a second light emission area which are arranged at a first interval along a first direction, the second light source section has a third light emission area and a fourth light emission area which are arranged at the first interval along the first direction, the condensing lens has a first aspheric lens on which light emitted from the first light emission area and the light emitted from the third light emission area become incident, a second aspheric lens on which light emitted from the second light emission area and the light emitted from the fourth light emitted area become incident, the first aspheric lens and the second aspheric lens are arranged at a second interval along the first direction, and the first and the second light source sections and the first and the second aspheric lenses are arranged in such way that the first interval and the second interval correspond to each other. a first aspheric lens on which light emitted from the first light emission area and the light emitted from the third light emission area become incident, a second aspheric lens on which light emitted from the second light emission area and the light emitted from the fourth light emitted area become incident, the first aspheric lens and the second aspheric lens are arranged at a second interval along the first direction, and the first and the second light source sections and the first and the second aspheric lenses are arranged in such way that the first interval and the second interval correspond to each other.