HYDRAULIC OPERATING DEVICE

A hydraulic operating device comprises a base member, an operating member, a piston, and a mounting member. The base member includes a cylinder bore, a first hose-attachment hole, and a second hose-attachment hole. The first hose-attachment hole is configured to be in fluid communication with the cylinder bore. The second hose-attachment hole is configured to be in fluid communication with the cylinder bore. The mounting member includes a mount opening through which the handlebar is to extend. The mount opening has a mount center axis. The base member includes a support portion configured to contact an outer circumferential surface of the handlebar without clamping the handlebar in a mounting state where the handlebar extends through the mount opening of the mounting member.