Processing apparatus including a water collection pan

A processing apparatus comprising:

• a chuck table for holding a workpiece;
• processing means for processing said workpiece held on said chuck table and supplying a processing water to said workpiece;
• a housing at least partially enclosing said processing means, said housing having a bottom;
• and
• a water pan fixed to the bottom of said housing and configured for receiving said processing water as a water leaked,
• said water pan including a side wall and a bottom wall that is inclined relative to a horizontal plane, said bottom wall including a plurality of bosses positioned adjacent to an inner surface of the side wall and forming a closed space between said water pan and said bottom of said housing, said bottom wall of said water pan having a low position, which is a position at a vertical distance from said bottom of said housing that is greater than a vertical distance of any other position from said bottom of said housing, and a discharge hole at said low position and a plurality of walls extending from said bottom wall and forming a plurality of corners, wherein said low position and said discharge hole are located at one of said corners, and wherein said water leaked is collected at said low position and discharged through said discharge hole.