Abstract: A quick release clamping device includes a hollow clamping cap, and a bolt member having an enlarged head portion disposed inside the hollow clamping cap and a threaded end portion engaging a nut member. A lever member has an eccentric shaft portion to be disposed in a through bore formed on the head portion of the bolt member. A locking ring prevents axial sliding of the eccentric portion inside the through bore. The lever member is operated to axially move the bolt member between a slack position, in which the eccentric portion is not in contact with the head portion, and a tightened position, in which the eccentric portion pushes the head portion into the clamping cap to pull the nut member toward the clamping cap. The eccentric portion has an axially extending notch. A pull knob is to be disposed on the clamping cap. The pull knob has a rod portion extending through the clamping cap to releasably engage the notch.