We present results of SED fitting for LBGs at z~5 in the GOODS-N and its flanking fields. Among ~600 LBGs, we select ~100 objects which are uncontaminated in IRAC images by eye inspection. Using publicly available IRAC images in the GOODS-N and IRAC images we observed in the flanking fields, we constructed the rest-frame UV to optical SEDs and made SED fittings for the sub-sample of LBGs. From the derived stellar masses, we construct the stellar mass function of LBGs at z~5 after applying incompleteness corrections. By integrating the stellar mass function down to M*~10^8M_sun, we calculate the cosmic stellar mass density at z~5 to be 7x10^6 M_sun Mpc^-3. In this presentation, we will present comparisons of the stellar mass function and the stellar mass density for our sample with other observations and semi-analytical models.
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