A lighting tool for a vehicle comprising: a first light source configured to emit first light; a second light source that is disposed adjacent to the first light source and that is configured to emit second light in a same direction as the first light; and a projection lens configured to project the first light and the second light in the same direction, wherein the projection lens has a first lens body including a first incidence section disposed at a side facing the first light source and a first emitting section disposed at a side opposite to the first incidence section, and a second lens body including a second incidence section disposed at a side facing the second light source and a second emitting section disposed at a side opposite to the second incidence section, a refractive index of the second lens body is smaller than a refractive index of the first lens body, a structure in which the first lens body and the second lens body are joined to each other via an intermediate layer which is interposed between facing boundary surfaces of the first lens body and the second lens body is provided, the intermediate layer being formed of a binding material with optical transparency, a refractive index of the intermediate layer is smaller than the refractive index of the first lens body, the refractive index of the second lens body is equal to or smaller than the refractive index of the intermediate layer, among the first light that has entered inside of the first lens body from the first incidence section, the first light reflected at the boundary surface is emitted from the first emitting section to an outside of the first lens body, and among the second light that has entered inside of the second lens body from the second incidence section, the second light that has passed through the boundary surface is emitted from the first emitting section to the outside of the first lens body. a first light source configured to emit first light; a second light source that is disposed adjacent to the first light source and that is configured to emit second light in a same direction as the first light; and a projection lens configured to project the first light and the second light in the same direction, wherein the projection lens has a first lens body including a first incidence section disposed at a side facing the first light source and a first emitting section disposed at a side opposite to the first incidence section, and a second lens body including a second incidence section disposed at a side facing the second light source and a second emitting section disposed at a side opposite to the second incidence section, a refractive index of the second lens body is smaller than a refractive index of the first lens body, a structure in which the first lens body and the second lens body are joined to each other via an intermediate layer which is interposed between facing boundary surfaces of the first lens body and the second lens body is provided, the intermediate layer being formed of a binding material with optical transparency, a refractive index of the intermediate layer is smaller than the refractive index of the first lens body, the refractive index of the second lens body is equal to or smaller than the refractive index of the intermediate layer, among the first light that has entered inside of the first lens body from the first incidence section, the first light reflected at the boundary surface is emitted from the first emitting section to an outside of the first lens body, and among the second light that has entered inside of the second lens body from the second incidence section, the second light that has passed through the boundary surface is emitted from the first emitting section to the outside of the first lens body.