A mixing tip for mixing two kinds of pastes, to be locked and fixed on a syringe holder, the mixing tip includes a housing (2) internally having a mixing element (1), a paste guiding member (3) being fixed to an end part positioned at the opposite side to an ejection port of the housing (2), and a locking member having a pawl part to be locked with a locking hole formed on the syringe holder and a projection part to be inserted to a hole part bored on the syringe holder, or has a pair of pawl parts to be inserted to and locked with two locking holes formed on the syringe holder, and the housing (2) and the paste guiding member (3) are made of a colored plastic material not transmitting a light having a wavelength photo-activating the photopolymerization catalyst.
