PURPOSE: To provide a balance chair which can reduce physical burden on a person who performs a work while his arms are raised.

CONSTITUTION: The first link 10 is supported under freely rotatable condition on a fixing part 8 of a chair main body 1 and the second link 11 for supporting the upper arm is supported on a shaft on the upper end of the first link 10 and an end part of the third link 12 for supporting the forearm is supported on a shaft on an apex of the second link 11 and another end α11 of the first auxiliary link 14 and another end α12 of the second link 11 are connected with the first sub-link 16 and another end α13 of the second auxiliary link 15 and one end α7 of a crank member 17 are connected with the second sub-link 18. In addition, one parts α5 and α6 of the third link 12 and another ends α8 and α9 of the crank member 17 are connected with the third sub-links 19a and 19b and the first and the second counter wt. W1 and W2 are respectively provided on connecting shafts and α11.