A McKibben's artificial muscle 1, which may have improved durability in one end portion, comprises a flexible tube 10 and a braided tube 20. The elastic tube 10 is a hollow and cylindrical elastic body member. The braided tube 20 is formed by round-knit filaments having a predetermined knitting angle, which are wound around a circumference of the elastic tube 10 in a movable manner. The braided tube 20 has a contraction portion 21 and a restriction portion 22. The braided tube 20 is circular knit in the contraction portion 21, with a knitting angle that allows the elastic tube to radially expand and contract in a longitudinal direction to thereby obtain a contraction force. The braided tube 20 is knitted in the restriction portion 22, with a knitting angle suppressing radial expansion in the vicinity of an end portion 11 of the elastic tube 10.
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