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. <EOS>