To provide a builder suitable to compose a liquid detergent composition good in storage stability, excellent in detergency and pollution prevention to soiling with the soil or sebum stain, and a liquid detergent composition compounded therewith.

This liquid detergent composition contains a water-soluble graft polymer having a polymer chain (1) partly having a repeating unit comprising a styrene structure may be having at least one substituent and a polymer chain (2), and satisfies the following conditions (a) or (b). Condition (a): the polymer chain (1) is a trunk chain and the polymer chain (2) is a side chain. Condition (b): the polymer chain (2) is a trunk chain and the polymer chain (1) is a side chain, but in this case, the polymer chain (2) must not be a polyether.