A headlamp unit for attachment to a vehicle body of a leaning vehicle, the headlamp unit comprising: a support member having an attachment part configured to be attached to the vehicle body; a headlamp module including a headlamp LED; a sub-lamp module including a sub-lamp LED, which is different from the headlamp LED; and a cover module configured to cover, in a state in which the headlamp unit is provided to the leaning vehicle, at least a portion of the support member, at least a portion of a non-light emission part of the headlamp module, and at least a portion of a non-light emission part of the sub-lamp module while allowing at least a portion of a light emission part of the headlamp module and at least a portion of a light emission part of the sub-lamp module to be visible from a location in front of the leaning vehicle, wherein the support member is configured to individually support all of the headlamp module, the sub-lamp module, and the cover module so that the support member and each module have no other modules interposed therebetween, wherein the other modules are the headlamp module, the sub-lamp module, and the cover module, with at least a portion of the attachment part exposed to the outside of the cover module for the attachment of the attachment part of the support member to the vehicle body, characterized in that said at least a portion of the light emission part of the headlamp module and said at least a portion of the light emission part of the sub-lamp module are not covered by the cover module and are exposed to the outside of the headlamp unit so that the exposed portions are visible from the location in front of the leaning vehicle. a support member having an attachment part configured to be attached to the vehicle body; a headlamp module including a headlamp LED; a sub-lamp module including a sub-lamp LED, which is different from the headlamp LED; and a cover module configured to cover, in a state in which the headlamp unit is provided to the leaning vehicle, at least a portion of the support member, at least a portion of a non-light emission part of the headlamp module, and at least a portion of a non-light emission part of the sub-lamp module while allowing at least a portion of a light emission part of the headlamp module and at least a portion of a light emission part of the sub-lamp module to be visible from a location in front of the leaning vehicle, wherein the support member is configured to individually support all of the headlamp module, the sub-lamp module, and the cover module so that the support member and each module have no other modules interposed therebetween, wherein the other modules are the headlamp module, the sub-lamp module, and the cover module, with at least a portion of the attachment part exposed to the outside of the cover module for the attachment of the attachment part of the support member to the vehicle body, characterized in that said at least a portion of the light emission part of the headlamp module and said at least a portion of the light emission part of the sub-lamp module are not covered by the cover module and are exposed to the outside of the headlamp unit so that the exposed portions are visible from the location in front of the leaning vehicle.