A minimized camcorder including a knob for a mode-changing device. The camcorder includes a knob rotatably installed on a case. A knob holder is provided for holding the knob on the inside of the case to prevent the knob from separating from the case. A plate spring is installed inside the case and has locking swells to provide tactile feedback. A ring plate rotates together with the knob holder and has locking parts formed with a plurality of holes into which the locking swells are locked.