The chair type stretching apparatus in this invention comprises a seat, a backrest, a flexible sheet, a tension means, and a controller. The backrest has a width. The flexible sheet is disposed in front of the backrest to be movable between a normal position and a projected position. The flexible sheet in the normal position lies in a close relation with a front surface of the backrest. The flexible sheet in the projected position is spaced away from the front surface of the backrest. The tension means is provided on the backrest in order to apply tensional force to the flexible sheet so as to move a center of the flexible sheet toward a front direction of the backrest. The tension means is provided on at least one width end of the backrest in order to apply tensional force along a width direction of the backrest to the flexible sheet.
