An ambulatory exercise machine which can easily carry out suitable ambulatory exercise in accordance with a condition of a trainee. A walking path surface is provided for the trainee and a drive drives the walking path surface. An assist arrangement is provided which includes support arms supporting the waist part of the trainee in front and at sides of the trainee and which enables a space between left and right arms to be adjusted. The assist arrangement includes a drive which drives the support arms. Further, the support arms enable attachment of a belt for holding the trainee so that the trainee is movable within a desired range.