A steering device comprising: an inner column having a cylindrical shape and rotatably supporting an input shaft connected to a steering wheel; an outer column having a cylindrical shape into which at least a part of the inner column is inserted, and having a slit formed by notching one end thereof at which the inner column is inserted; a column bracket fixed to a vehicle body side member and tightening the outer column by a pressing bracket squeezing the outer column; a pressed portion provided on the outer periphery of the inner column; a first tightening mechanism tightening the outer column in response to a rotation of a manipulation lever; and a second tightening mechanism biasing a lock member to the pressed portion in a tilt direction in response to the rotation of the manipulation lever, characterized in that the steering device further comprises: a separation mechanism causing the inner column to be detachable when the inner column changes a relative position with respect to the pressing bracket, in a state where the first tightening mechanism tightens the outer column and the second tightening mechanism biases the lock member to the pressed portion in the tilt direction, wherein the lock member includes a first lock member and a second lock member that are divided in the tilt direction, and wherein the separation mechanism detachably fixes the second lock member to the first lock member contacting the pressed portion. an inner column having a cylindrical shape and rotatably supporting an input shaft connected to a steering wheel; an outer column having a cylindrical shape into which at least a part of the inner column is inserted, and having a slit formed by notching one end thereof at which the inner column is inserted; a column bracket fixed to a vehicle body side member and tightening the outer column by a pressing bracket squeezing the outer column; a pressed portion provided on the outer periphery of the inner column; a first tightening mechanism tightening the outer column in response to a rotation of a manipulation lever; and a second tightening mechanism biasing a lock member to the pressed portion in a tilt direction in response to the rotation of the manipulation lever, characterized in that the steering device further comprises: a separation mechanism causing the inner column to be detachable when the inner column changes a relative position with respect to the pressing bracket, in a state where the first tightening mechanism tightens the outer column and the second tightening mechanism biases the lock member to the pressed portion in the tilt direction, wherein the lock member includes a first lock member and a second lock member that are divided in the tilt direction, and wherein the separation mechanism detachably fixes the second lock member to the first lock member contacting the pressed portion. a separation mechanism causing the inner column to be detachable when the inner column changes a relative position with respect to the pressing bracket, in a state where the first tightening mechanism tightens the outer column and the second tightening mechanism biases the lock member to the pressed portion in the tilt direction, wherein the lock member includes a first lock member and a second lock member that are divided in the tilt direction, and wherein the separation mechanism detachably fixes the second lock member to the first lock member contacting the pressed portion.