A position adjustable steering device, comprising: a steering column that includes an outer tube and an inner tube that are fitted to each other so as to be relatively slidable in an axial direction of the steering column to make telescopic adjustment, and that support a steering shaft such that the steering shaft is rotatable; a fixed bracket that has a pair of clamping side plates (29, 30), and that is fixed to a vehicle body; a movable bracket that has a pair of clamped side plates (26, 50) arranged along inner side faces (29a, 30a) of the respective clamping side plates (29, 30), and that is fixed to the outer tube; a fastening mechanism that includes a fastening shaft that passes through the clamping side plates (29, 30) and the clamped side plates (26, 50), and that achieves telescopic lock by fastening the clamped side plates (26, 50) with use of the fastening shaft via the clamping side plates (29, 30) in accordance with a rotating operation of an operating lever; and an insertion hole (11 b) that is formed in the outer tube; characterized by a pressing mechanism that moves in an axial direction of the fastening shaft in accordance with fastening by the fastening shaft, and that has a pressing member that presses the inner tube through the insertion hole (11 b); wherein the insertion hole (11 b) is formed in one side portion (11 a) of the outer tube; the pressing mechanism presses an outer face of one side portion of the inner tube through the insertion hole (11 b) in a direction parallel to the fastening shaft by being pressed by a corresponding one of the clamping side plates (29, 30) in accordance with fastening by the fastening mechanism; and a cross section of the inner tube pressed by the pressing mechanism is elastically deformed into an oblong elliptical shape. a steering column that includes an outer tube and an inner tube that are fitted to each other so as to be relatively slidable in an axial direction of the steering column to make telescopic adjustment, and that support a steering shaft such that the steering shaft is rotatable; a fixed bracket that has a pair of clamping side plates (29, 30), and that is fixed to a vehicle body; a movable bracket that has a pair of clamped side plates (26, 50) arranged along inner side faces (29a, 30a) of the respective clamping side plates (29, 30), and that is fixed to the outer tube; a fastening mechanism that includes a fastening shaft that passes through the clamping side plates (29, 30) and the clamped side plates (26, 50), and that achieves telescopic lock by fastening the clamped side plates (26, 50) with use of the fastening shaft via the clamping side plates (29, 30) in accordance with a rotating operation of an operating lever; and an insertion hole (11 b) that is formed in the outer tube; characterized by a pressing mechanism that moves in an axial direction of the fastening shaft in accordance with fastening by the fastening shaft, and that has a pressing member that presses the inner tube through the insertion hole (11 b); wherein the insertion hole (11 b) is formed in one side portion (11 a) of the outer tube; the pressing mechanism presses an outer face of one side portion of the inner tube through the insertion hole (11 b) in a direction parallel to the fastening shaft by being pressed by a corresponding one of the clamping side plates (29, 30) in accordance with fastening by the fastening mechanism; and a cross section of the inner tube pressed by the pressing mechanism is elastically deformed into an oblong elliptical shape.