We propose a cartridge-type dispenser suitable for dispensing viscous materials that allows the piston to be dispensed from the cartridge body and dispense contents with smooth operation. A main body 1 having a filling space M for contents and provided with a pouring nozzle 1a at the tip thereof is disposed so as to be slidable in the filling space M of the main body 1, and in the filling space M by applying a pushing force. In a cartridge-type dispenser provided with a piston 2 for pushing out the contents from the tip of the pouring nozzle 1a, the piston 2 has an outer peripheral wall along the inner peripheral wall of the main body 1 and a gap between the inner peripheral wall of the main body 1 A body part 2a disposed at a distance from each other, a tip wall part 2b provided at one end of the body part 2a and in direct contact with the contents in the filling space M, and provided at the other end of the body part 2a. This is composed of a rear end wall portion 2c that presses the rod and applies a pushing force to the piston 2 itself. And the protrusion 3 which contact abuts to the inner peripheral wall of this main body 1, and makes the applicable contact part the sliding part of piston 2, but does not block the inside of this main body is provided in the outer peripheral wall of the trunk drum 2a.ピストンがカートリッジ本体から簡単に脱落せず、なおかつスムーズな作動のもとで内容物を注出できる粘性材料の注出に適したカートリッジ式ディスペンサーを提案する。内容物の充填空間Ｍを有しその先端に注出ノズル１ａを備えた本体１と、該本体１の充填空間Ｍ内で摺動可能に配置され、押し込み力の付加によって該充填空間Ｍ内の内容物を注出ノズル１ａの先端より押し出すピストン２とを備えたカートリッジ式ディスペンサーにおいて、ピストン２を、本体１の内周壁に沿う外周壁を有し該本体の内周壁との相互間にて隙間を隔てて配置される胴体部２ａと、この胴体部２ａの一端に設けられ充填空間Ｍ内の内容物に直接接触する先端壁部２ｂと、該胴体部２ａのもう一端に設けられ、押し込み冶具のロッドを押し当ててピストン２そのものに押し込み力を付加する後端壁部２ｃからなるものにて構成する。そして、胴体部２ａの外周壁に、該本体１の内周壁に当接し、該当接部位をピストン２の摺動部とするが該本体の内部を封鎖しない突起３を設ける。
