Patent ID: 8113637

Claim:
A liquid supply device comprising: a supply pump which is provided in a liquid supply passage; a first unidirectional valve which is provided on the upstream side of the supply pump; a second unidirectional valve which is provided on the downstream side of the supply pump; and a plurality of constituent members which each includes a single passage forming member provided with a part or the whole of the liquid supply passage and each is laminated and which are formed such that a partial passage of the liquid supply passage permitting the first unidirectional valve to communicate with the supply pump and an another partial passage thereof permitting the supply pump to communicate with the second unidirectional valve are formed in the laminated state, wherein the supply pump and the first and second unidirectional valves are disposed on the substantially same plane by laminating the plurality of constituent members, the first unidirectional valve communicates with the supply pump by the partial passage, and the supply pump communicates with the second unidirectional valve by the another partial passage.