Washing machine and washing water supply device

A washing machine comprising:

• a main body including an opening in an upper portion of the main body;
• an outer tub in the main body;
• and
• a water supply device including:
• a detergent supply container configured to supply detergent to the outer tub,
• a washing water supply device at a rear side of the opening, the washing water supply device including:
• a housing,
• an inlet port through which water is suppliable into the housing, and
• an outlet port to discharge water supplied into the housing through the inlet port from the housing toward the opening, and
• a water supply valve configured to independently control a supply of water to the detergent supply container and a supply of water to the washing water supply device;
• and
• a water pressure regulation device in the housing and configured to reduce pressure of water flowing to the outlet port.