To provide a planter unit for setting handrails, enabling residents and the third persons to appreciate flowering plants likewise from the inside and outside of a room, and safe without bringing worry such as falling down.

This planter unit for setting handrails is characterized by forming by a side plate and a bottom plate an almost three dimensional shaped body with an opened upper part, and forming a means for setting a crossrail on the side plate and a means for connecting the three dimensional shaped body with the other adjacently arranged three dimensional shaped body each other.