The present invention relates to a composition for skin external application containing a Chamaecyparis obtusa polysaccharide as an active ingredient, and more particularly to a composition for skin external application containing a Chamaecyparis obtusa polysaccharide, which improves skin elasticity and reduces wrinkles by promoting collagen production, shows an excellent skin-whitening effect by inhibiting melanogenesis, improves skin moisturization by promoting keratinocyte differentiation, and has excellent anti-inflammatory and skin regeneration effects.