<p>A synthetic resin square bottle body capable of providing excellent grasping property and reduced pressure absorbing property and usable with ease by suppressing an inverted depressed deformation resulting from recessed parts for hanging the fingers of a user thereon by the shape of a body part wall. A peripheral groove-like waist part reduced in diameter is formed on a body part formed by disposing a plurality of panel faces parallel with each other at a roughly vertically center position so as to vertically divide these panel faces into upper and lower panel parts. The recessed parts for hanging the fingers thereon are formed in at least the pair of panel faces facing each other in prescribed areas starting at the waist parts to the upper end parts of the lower panel parts, and a pair of side ribs are formed on the lower panel faces near the right and left sides of the recessed parts.</p>