There is provided a sump (10) for dishwasher (1). The sump (10) includes a sump case for storing washing water, a washing pump assembly that is provided in the sump case (11) to pump out the washing water, and a filtering assembly (20) including a flow guide (21) in which food wastes contained in the washing water are accumulated during the circulation of the washing water, a sump cover (22) covering an opening of the sump case (11), and a self-cleaning assembly (23) for filtering the food wastes as the washing water directed to the flow guide flows back. The flow guide (21), the sump cover (22) and the self-cleaning assembly (23) are integrally formed through a thermal bonding.