A washer includes: a supply-water storage section configured to store supply water;a wastewater storage section configured to temporarily store wastewater anda wastewater heat recovery device including a water supply channel through which the supply water is supplied to the supply-water storage section and a drain channel through which the wastewater is drained from the wastewater storage section, and configured to exchange heat between the wastewater flowing in the drain channel and the supply water flowing in the water supply channel.the wastewater heat recovery device is disposed below the washing chamber, and is provided in a machine chamber in which a pump configured to deliver the supply water from the supply-water storage section to the washing chamber is disposed, andthe drain channel is connected to a drain hole of the wastewater storage section.