To provide a device which can apply an arbitrary constant resistance load to a swimmer, and at the same time, on the contrary, can pull the swimmer by an arbitrary constant force in the advancing direction of the swimmer, and also, can easily numerically set the resistance load and the magnitude of the pulling force.

This device for swimming training is constituted of a rope to be connected with the swimmer, a drum and a traverse device for taking up or feeding out the rope, a guide roller for guiding the rope, a servo motor for driving the drum, a control panel for controlling the servo motor, and an operation panel for setting the loading force and the pulling force.