A bicycle operating device comprises a base member, an operating structure, and a support plate. The operating structure includes a rotatable member rotatable relative to the base member about a rotational axis to control a bicycle component. The operating structure includes a first axial end and a second axial end. The first axial end is secured to the base member. The second axial end is opposite to the first axial end along the rotational axis. The support plate is attached to the second axial end to be movable relative to the base member and contactable with the base member.