A surgical treatment apparatus according to the present invention includes an outer sheath, extending from a base portion subject to an operators hand to the tip subject to insertion into a body cavity, that is provided with a working channel through which a treatment instrument can be passed an image pickup device disposed at the tip portion of the outer sheath and pivotable forceps disposed at the tip portion of the outer sheath, supported on a supporting section protruding in the axial direction via a joint being bent away from the working channel, and having a pair of forceps members arranged so as to be freely opened/closed, wherein the image pickup device is disposed at a position between the axis line of the supporting section and the axis line of the working channel and offset from an imaginary line connecting the two axis lines.
