The aim of this study is to determine the physical input quantity used in peanut production and unit cost, and to make the functional analysis of the aforementioned production in the farms of Osmaniye province. The data used in the study belongs to 2009 growing season and they are collected by finite population sampling method from 44 farms in the 27 villages of 6 counties in Osmaniye province. The inputs used per decare in peanut production are determined as follows respectively: 1 h male labor force, 0.54 h tractor traction, 8.60 kg seed, 21.40 fertilizer and 0.25 kg pesticide in averages. 1 kg peanut cost is 1.10 TL in 2009 prices. The function is Y = 1.069X(1)(-0.315)X(2)(0.441)X(3)(0.701)X(4)(-0.441)X(5)(-0.947)X(6)(0.204)X(7)(-1.656) function is determined by using Cobb-Douglas production function analysis between production and inputs used. Multiple correlation coefficient (R(2)) is 0.578. The sum of production elasticities for production function is Sigma b(i) = -2.013.