To provide a cylindrical sampling device for a soil test, operable by manpower without using a special auxiliary tool, and capable of easily sampling even a block in the unconsolidated natural ground.

By arranging a handle 2 for pushing in/rotating an outer cylinder part 3 having a cutter blade 6 with its axis M as the center and a pressing lever 20 pressing the outer cylinder part 3 in the excavation direction, a worker can rotates the handle 2 while applying its body weight toward the excavation direction to the pressing lever 20, and the unconsolidated natural ground can be easily and efficiently excavated and sampled thereby.