The present invention relates to food products in order to create a bolus by causing chewing to the subject, to assess the chewing ability by measuring the size distribution of the bolus particles constituting the bolus, the bolus diffusion method for possible uniformly spread the particles to provide an observation apparatus for observing a bolus particles diffused. A bolus and the mixed solution obtained by mixing the adjusted solution was poured into a dish-like container, when it is diffused along the bottom surface of the dish-shaped container bolus particles constituting the bolus, the plates As a first inclined state in which it is inclined to the bottom surface of the dish-like container to be higher than the one end edge side other end edge side of the lateral direction of the Jo vessel and moves the liquid mixture in the dish-shaped container at the other end edge side After then, is the one of the second inclined state in which it is inclined to the bottom surface of the dish-shaped containers in the opposite direction to lower than the other end edge side end edge of the dish-shaped container, after which the horizontal bottom surface of the dish-shaped container diffusing the bolus of food particles by the state.BACKGROUND 7【課題】食品を被検者に咀嚼させることで食塊を作成し、この食塊を構成している食塊粒子の大きさの分布を測定することで咀嚼能力を評価するために、食塊粒子をできるだけ均一に拡散させる拡散方法、拡散させた食塊粒子を観察するための観察装置を提供する。【解決手段】食塊と調整液とを混合した混合液を皿状容器内に注ぎ入れて、食塊を構成している食塊粒子を皿状容器の底面に沿って拡散させる際に、皿状容器の左右方向の一方の端縁側を他方の端縁側よりも高くすることで皿状容器の底面を傾斜させた第1傾斜状態として、皿状容器内の混合液を他方の端縁側に移動させた後に、皿状容器の一方の端縁側を他方の端縁側よりも低くすることで皿状容器の底面を逆方向に傾斜させた第2傾斜状態とし、その後、皿状容器の底面を水平状態とすることで食塊粒子を拡散させる。【選択図】図7
