In this paper, inversed coefficients of subgrade reaction (k
h) estimated from past horizontal load test data of single piles with wide range diameter in cohesive soil deposit are studied. As the result, reference k
h (k
h0) calculated with unconfined compression strength has good correspondence with inversed k
h0. The inversed k
h0 obtained from the values at y/B = 0.01 (y: pile displacement, B: pile diameter) has good correspondence with that obtained from the values at y = 1cm. Further, the variation of the calculated k
h0 based on y/B = 0.01 and B
-1/2 or B
-3/4 is smaller than that based on the method of the AIJ recommendations.
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