TRAY AND TRAY MANUFACTURING METHOD

A tray () including a bottom wall () and a peripheral side wall () erected from an outer periphery of the bottom wall () includes a high-strength portion HT having a high tensile strength; and a low-strength portion LT having a tensile strength lower than that of the high-strength portion HT. The low-strength portion LT includes a recessed portion (C) having a corner portion (C) in a first side wall inner surface () and a second side wall inner surface () which are adjacent to each other at a minor angle and a corner section (C) on an upper surface () of the bottom wall () having a minor angle to each of the first side wall inner surface () and the second side wall inner surface ().