The present invention provides an absorbent article for animals comprising a belt portion and an absorbing main portion fixed to the belt portion, wherein the absorbing main portion does not easily slip or detach from the belt portion. This absorbent article for animals comprises a belt portion (1) and an absorbing main portion (10). The absorbing main portion (10) has an oblong shape having a longitudinal direction and a width direction in the planar view of the unfolded state and has an inner surface that faces the skin of an animal when being worn and an outer surface that is the face on the side opposite to the inner face. Furthermore, at least one end of a back-side end (EL4) and an abdominal side end (EL3) positioned on either end in the longitudinal direction is provided with, on at least one of the inner surface and the outer surface, an absorbing main portion side engaging portion that is inserted into a body-facing side of the belt portion (1) or the interior of the belt portion (1) from the rear side in the front-to-rear direction of the animal and engages the body-facing side of the belt portion (1) or the surface of the interior.本發明，是具備帶體部與被固定在該帶體部的吸收本體部之動物用吸收性物品，即是提供前述吸收本體部不易從前述帶體部偏移、或不易脫落的動物用吸收性物品。 本發明的動物用吸收性物品，係具備有：帶體部(1)、及吸收本體部(10)，前述吸收本體部(10)在展開後的狀態的俯視觀看，具有具長邊方向及寬邊方向的縱長的形狀，並且具有穿戴時和動物的肌膚面對置的內表面、以及成為該內表面的相反側的面的外表面，再者，位在前述長邊方向的兩端的背部側端部(EL4)及腹部側端部(EL3)中的至少一方的端部，在前述內表面及前述外表面中的至少一方的面具備有：將從動物的前後方向中的後方側插入至前述帶體部(1)的胴體對置面側或前述帶體部(1)的內部而與前述帶體部(1)的胴體對置面或前述內部的表面卡合的吸收本體部側卡合部。
