The invention provides a motor module and a vacuum cleaner. This motor module includes a motor, a fan, and a casing arranged to house the motor and the fan therein. The casing includes a tubular bodyportion arranged to extend in an axial direction, an air inlet, an air outlet, a flow passage, and a partitioning portion. The flow passage is a space arranged to join the air inlet and the air outletto each other between the body portion and the motor. The partitioning portion is arranged in the flow passage to partition the flow passage. The flow passage includes a fan accommodating portion, afirst silencing chamber arranged to be in communication with the fan accommodating portion through a first communicating passage, and a second silencing chamber arranged to be in communication with the first silencing chamber through a second communicating passage. The second silencing chamber is arranged to be in communication with the air outlet. The first silencing chamber is arranged to have aflow passage cross-sectional area greater than that of the first communicating passage. The second silencing chamber is arranged to have a flow passage cross-sectional area greater than that of the second communicating passage. Two expansion-type silencers, one defined by the first communicating passage and the first silencing chamber and the other defined by the second communicating passage andthe second silencing chamber, are arranged between the fan and the air outlet, so that noise generated in the fan can be reduced with high efficiency.