A directional practice device includes an elongated ball-receiving member disposed on a flat surface and having a slot adapted for receiving a plurality of golf balls, and an upright heel-engaging surface disposed at a side of the ball-receiving member and perpendicular to the flat surface. The heel-engaging surface has a lower end defining a side of a head-traveling path extending along a longitudinal direction. The golf balls can be pushed by a putter head to drop from the slot onto the head-traveling path one at a time. After one of the golf balls drops onto the head-traveling path, the putter head can be moved along the head-traveling path to strike the one of the golf balls in the longitudinal direction in such a manner that the heel of the putter head moves on the heel-engaging surface.