Abstract: A packaging device has a packaging box (12) formed by using a corrugated cardboard sheet and also has a first cushioning member (14) and a second cushioning member (16) that hold an object (W) in the packaging box (12). Each of the set of the cushioning members (14, 16) is formed by bending a corrugated cardboard sheet and has a holding surface section (40; 50) used to hold the object (W) and also has support surface sections (42a, 42b; 52a, 52b) continuing, at a first pair of opposite sides of the holding surface section (40; 50). The support surface sections (42a, 42b; 52a, 52b) are in surface contact with side faces (22, 24) of the packaging box (12) and tip ends of the support surface sections (42a, 42b; 52a, 52b) are in contact with a bottom face (20) of the packaging box (12).