Provided is a strain testing machine capable of observing, analyzing, etc. of a test body while retaining the shape state that the test body can take in the strain test without removing the test body after starting the strain test. A predetermined deformation in which each of the other at least two parts of the test body is attached to the first attachment part of the first part and the second attachment part of the second part, and returns from the first shape state to the second shape state and back again to the first shape state. A deformation testing machine comprising: a detachable part that repeats a displacement cycle that is a relative displacement of a second part with respect to a first part causing a cycle to occur in a test body; and a main body part to which the detachable part is detachably attached; the state retaining means for fixing the relative position of the second part with respect to the first part in at least one shape state among It is a deformation testing machine that is detachable from the body part.
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