Abstract: An improved underarm cane device including a cane having a Y-type structure with an upper end portion and two rods extending therefrom. The arm supporter structure includes an arm supporter and two ends, with each end of the arm supporter structure having a ring through which each one of the two rods of the upper end portion of the cane extends through, in order to arrange the arm supporter structure between the two rods of the upper end of the cane. The rings each have an outer side with a through bore and a protrusion. The protrusions at the outer sides of the rings including a groove. Bores are longitudinally arranged along the length of each of the two rods. Locking pieces are configured to secure the arm supporter structure between the two rods wherein each of the locking pieces secures the arm supporter structure on the two rods. The device includes L-shaped locking pieces each having a centrally positioned tenon, and each of the locking pieces having an inner side and outer side.