Tail lamp unit for motorcycle

In a tail lamp unit for a motorcycle, a reflection member (21) includes a first reflection section (31), a second reflection section (32) and a third reflection section (33). A first partition section (41) and a second partition section (42), produced as individual components separated from the reflection member (21), are disposed rearwards of the reflection member (21). The first partition section (41) separates a first container space (S1) for disposing a right flasher bulb (26) and a third container space (S3) for disposing a tail lamp bulb (25). The second partition section (42) separates the third container space (S3) and a second container space (S2) for disposing a left flasher bulb (27). The first and second partition sections (41, 42) may be disposed either in parallel to each other or at an interval gradually backwardly reduced.