A motion simulating device including a positioning unit and at least one carrier unit that is connected to said positioning unit and that is adapted for carrying at least one user, characterized in that said positioning unit includes two parallel and spaced apart walls, said motion simulating device further includes: a plurality of motion mechanisms each including a motion arm that has a first end portion connected to one of said walls of said positioning unit and pivotable relative to said positioning unit about a first axis, and a second end portion opposite to said first end portion, said at least one carrier unit being connected to said second end portion of said motion arm and being pivotable relative to said motion arm about a second axis, a support arm having two end portions that are respectively and pivotally connected to the other one of said walls of said positioning unit and said at least one carrier unit, said support arm and said motion arm being respectively and pivotally connected to opposite left and right sides of said at least one carrier unit, a first driver that is disposed for driving the pivot action of said motion arm about the first axis relative to said positioning unit, and a second driver that is disposed for driving the pivot action of said at least one carrier unit about the second axis relative to said motion arm; and a display unit for displaying image information for viewing by the at least one user. said positioning unit includes two parallel and spaced apart walls, said motion simulating device further includes: a plurality of motion mechanisms each including a motion arm that has a first end portion connected to one of said walls of said positioning unit and pivotable relative to said positioning unit about a first axis, and a second end portion opposite to said first end portion, said at least one carrier unit being connected to said second end portion of said motion arm and being pivotable relative to said motion arm about a second axis, a support arm having two end portions that are respectively and pivotally connected to the other one of said walls of said positioning unit and said at least one carrier unit, said support arm and said motion arm being respectively and pivotally connected to opposite left and right sides of said at least one carrier unit, a first driver that is disposed for driving the pivot action of said motion arm about the first axis relative to said positioning unit, and a second driver that is disposed for driving the pivot action of said at least one carrier unit about the second axis relative to said motion arm; and a display unit for displaying image information for viewing by the at least one user. a plurality of motion mechanisms each including a motion arm that has a first end portion connected to one of said walls of said positioning unit and pivotable relative to said positioning unit about a first axis, and a second end portion opposite to said first end portion, said at least one carrier unit being connected to said second end portion of said motion arm and being pivotable relative to said motion arm about a second axis, a support arm having two end portions that are respectively and pivotally connected to the other one of said walls of said positioning unit and said at least one carrier unit, said support arm and said motion arm being respectively and pivotally connected to opposite left and right sides of said at least one carrier unit, a first driver that is disposed for driving the pivot action of said motion arm about the first axis relative to said positioning unit, and a second driver that is disposed for driving the pivot action of said at least one carrier unit about the second axis relative to said motion arm; and a motion arm that has a first end portion connected to one of said walls of said positioning unit and pivotable relative to said positioning unit about a first axis, and a second end portion opposite to said first end portion, said at least one carrier unit being connected to said second end portion of said motion arm and being pivotable relative to said motion arm about a second axis, a support arm having two end portions that are respectively and pivotally connected to the other one of said walls of said positioning unit and said at least one carrier unit, said support arm and said motion arm being respectively and pivotally connected to opposite left and right sides of said at least one carrier unit, a first driver that is disposed for driving the pivot action of said motion arm about the first axis relative to said positioning unit, and a second driver that is disposed for driving the pivot action of said at least one carrier unit about the second axis relative to said motion arm; and a display unit for displaying image information for viewing by the at least one user.