To provide a tissue pressurizing instrument capable of keeping a distance between an endoscope and a lesion such that a lesion image can be sufficiently projected and preventing a part excluding a part in contact with a tissue near the lesion from obstructing the visual field of the endoscope.

The visual field of the endoscope is widened by pressurizing the tissue such as a plica which blocks the visual field of the endoscope near the lesion by a pressurizing plate, and the distance from the lesion is kept such that the image of the tissue to be examined or treated can be sufficiently projected. Then, the part excluding the part in contact with the tissue does not obstruct the visual field of the endoscope by manipulating the pressurizing plate so as to operate by an operation wire. Thus, diagnosis by the endoscope and medical treatment using an endoscope auxiliary instrument are easily performed.

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