A fan motor apparatus for a vacuum cleaner is provided. The fan motor apparatus may include a fan motor, an outer casing surrounding at least a part of the fan motor, wherein the outer casing includes a discharge portion having a discharge port; and, a noise-absorbent member is supported by the discharge port such that the port is closed, wherein the noise-absorbent member changes its shape to form a leakage space when internal exhaust pressure of the fan motor exceeds a predetermined degree.