An automotive two-wheeled vehicle direction indicator device, comprising a directional signal light for automotive two-wheeled vehicles such as saddle riding type vehicles, the directional signal light comprising: a lighting unit; a plurality of light sources that are arrayed in the lighting unit in a vehicle width direction; a plurality of light chambers in which at least one light source is arranged, wherein the plurality of light chambers are arrayed in the vehicle width direction; and inner lenses, wherein each inner lens is a translucent body forming a light-emitting surface for each of its corresponding light chambers, and the automotive two-wheeled vehicle direction indicator device performing a dynamic direction indication by chain-reactive switch-ons or switch-offs of the plurality of light sources when the directional signal light is activated, wherein in the directional signal light, the plurality of light chambers that are arrayed in the vehicle width direction are partitioned by a light-blocking wall made of an opaque member, wherein a front end of the light-blocking wall reaches the light-emitting surfaces, characterized in that a hook portion is formed at the front end, to thereby block out light between the light-emitting surfaces of the light chambers that are adjacent to each other, the hook portion forms an end face that is flush with the light-emitting surfaces, on each light-emitting surface, a step portion is formed, and the step portions are respectively joined to the hook portion by being brought into abutment therewith from a light chamber side. a directional signal light for automotive two-wheeled vehicles such as saddle riding type vehicles, the directional signal light comprising: a lighting unit; a plurality of light sources that are arrayed in the lighting unit in a vehicle width direction; a plurality of light chambers in which at least one light source is arranged, wherein the plurality of light chambers are arrayed in the vehicle width direction; and inner lenses, wherein each inner lens is a translucent body forming a light-emitting surface for each of its corresponding light chambers, and a lighting unit; a plurality of light sources that are arrayed in the lighting unit in a vehicle width direction; a plurality of light chambers in which at least one light source is arranged, wherein the plurality of light chambers are arrayed in the vehicle width direction; and inner lenses, wherein each inner lens is a translucent body forming a light-emitting surface for each of its corresponding light chambers, and the automotive two-wheeled vehicle direction indicator device performing a dynamic direction indication by chain-reactive switch-ons or switch-offs of the plurality of light sources when the directional signal light is activated, wherein in the directional signal light, the plurality of light chambers that are arrayed in the vehicle width direction are partitioned by a light-blocking wall made of an opaque member, wherein a front end of the light-blocking wall reaches the light-emitting surfaces, a hook portion is formed at the front end, to thereby block out light between the light-emitting surfaces of the light chambers that are adjacent to each other, the hook portion forms an end face that is flush with the light-emitting surfaces, on each light-emitting surface, a step portion is formed, and the step portions are respectively joined to the hook portion by being brought into abutment therewith from a light chamber side.