Disclosed is a microwave oven having a coffee maker with a structure wherein a user can easily clean a filter basket (420), the microwave oven includes a first housing (100) having a cooking chamber (110) being opened or closed by a door (130) and a component chamber (120) having components for irradiating microwave into the cooking chamber (110), a second housing (200) provided in the first housing (100) and having an open side, a water reservoir (300) provided in the second housing (200), a filter basket assembly (400) provided to be withdrawn from or inserted into the second housing (200) and separated from the water reservoir (300), a water supplying tube supplying water in the water reservoir (300) to the filter basket assembly (400), a heater for heating water flowing in the water supplying tube and a container (700) provided to be withdrawn from or inserted into the second housing (200) for receiving coffee dropped from the filter basket assembly (400).