A shift operating device comprising: a bracket member configured to be mounted to a bicycle; a first user operating lever pivotally mounted to the bracket member,; a support structure (39, 50, 63) removably mounted to the bracket member; a wire takeup member movably supported by the support structure; a positioning mechanism (54, 55) including a first positioning member movably supported by the support structure and configured to integrally move with the wire takeup member, and a second positioning member supported by the support structure and configured to engage the first positioning member such that the first positioning member has a plurality of operating positions; and a control member having a first portion movably supported by the support structure (39, 50, 63) inside the bracket member and a second portion disposed outside the bracket member, the control member being operatively coupled to the positioning mechanism (54, 55) for changing the operating position of the first positioning member, the support structure including a support member, wherein the support structure includes a main axle, the main axle and the support member being coupled together as a unit, with the wire takeup member mounted on the main axle, characterized in that the first user operating lever is a dual function operating lever configured to perform a wire pulling operation and a braking operation; the support member being slidably removable from the bracket member while the first user operating lever remains attached to the bracket member in a functionally operable state, with the support structure, the wire takeup member, the positioning mechanism, the second positioning member and the control member being removable from the bracket member while the first user operating lever remains attached to the bracket member in a functionally operable state. a bracket member configured to be mounted to a bicycle; a first user operating lever pivotally mounted to the bracket member,; a support structure (39, 50, 63) removably mounted to the bracket member; a wire takeup member movably supported by the support structure; a positioning mechanism (54, 55) including a first positioning member movably supported by the support structure and configured to integrally move with the wire takeup member, and a second positioning member supported by the support structure and configured to engage the first positioning member such that the first positioning member has a plurality of operating positions; and a control member having a first portion movably supported by the support structure (39, 50, 63) inside the bracket member and a second portion disposed outside the bracket member, the control member being operatively coupled to the positioning mechanism (54, 55) for changing the operating position of the first positioning member, the support structure including a support member, wherein the support structure includes a main axle, the main axle and the support member being coupled together as a unit, with the wire takeup member mounted on the main axle, characterized in that the first user operating lever is a dual function operating lever configured to perform a wire pulling operation and a braking operation; the support member being slidably removable from the bracket member while the first user operating lever remains attached to the bracket member in a functionally operable state, with the support structure, the wire takeup member, the positioning mechanism, the second positioning member and the control member being removable from the bracket member while the first user operating lever remains attached to the bracket member in a functionally operable state.