To provide a displacement mechanism allowing acquisition of a large curve angle by practically using small displacement of a shape-memory alloy wire.
This displacement mechanism wherein a first pipe and a second pipe turn around a connection part includes: the first pipe having a fixing part; the second pipe having a fixing part, and connected to the first pipe through the connection part; and the shape-memory member firmly fixed to the fixing part of the first pipe and the fixing part of the second pipe. About each of the first pipe and the second pipe, a distance D1 in a radial direction between the centers of the connection part and the fixing part, and a distance D0 from the center of the fixing part to a position most distant from the fixing part of the peripheral surface of the pipe satisfy the following formula (1): D0-D1>D1.
SAKAMOTO TETSUYUKI
KASAI YASUAKI
Iwao Hirayama
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