To provide a cooker that can restrain a liquid material such as moisture generated during cooking of food from entering a decompression pump.SOLUTION: In a cooker (1), a trap (5) is arranged in the middle of a flow passage connecting a cooking tank (2) and a decompression pump (3) in such a manner that a first decompression pipe (41) and a second decompression pipe (42) are connected thereto. The trap (5) traps moisture or the like included in air sucked from the cooking tank (2) depending on operation of the decompression pump (3), and stores it as a liquid material. In addition, a liquid material discharge pipe (7) provided with a trap side opening/closing mechanism (71) is connected to the trap (5).SELECTED DRAWING: Figure 1

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