A compressing machine includes a press unit for compressing a concentrated sludge within a squeezing chamber to provide a briquette, and a press control unit to control the press unit. The press control unit includes a parameter and compressing speed setting unit, a parameter measuring unit, and a compressing speed control unit. The parameter and compressing speed setting unit is a unit in which a relation between a predetermined parameter that may affect compression performed by the press unit, and a compressing speed of the press unit. The predetermined parameter may include a coolant temperature, ambient temperature or a coolant content and others. The parameter measuring unit is a unit to measure the predetermined parameter. The compressing speed control unit controls, based on a result of measurement by the parameter measuring unit, the compressing speed of the press unit in accordance with a content set in the parameter and compressing speed setting unit.
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