Cutting board excellent in a drainage function

A cutting board for placement on an upper section of a sink, comprising:

• a cutting board body including retaining holes being provided in at least one lateral edge surface of the cutting board itself, each of said retaining holes including a screw hole at an end side of the retaining hole and a first fitting portion at an opening side of the retaining hole;
• projecting straight rods being inserted into the retaining holes, each of said straight projecting rods including a cylindrical second fitting portion and a threaded portion to be screwed onto the screw hole, to leave ends of the second fitting portions projecting, as projecting portions, from the side surface of the cutting board body,
• a remaining portion of each of said second fitting portions being fit into a corresponding one of said first fitting portions, a boundary face between each of the first portions and the second fitting portions being substantially water-tight;
• each of the projecting straight rods being pivoted in a forward and reverse direction to allow the threaded portion thereof to move in a left and right direction within the screw hole,
• a length of each of the projecting portions projecting from the side surface of the cutting board being adjustable, as required, to finally fasten each of the projecting straight rods
• such that the cutting board is receivably supportable on the upper section of the sink by the projecting portions of the projecting straight rods and an opposite end of the cutting board.