A carry-in/out system comprising: a raw material loading part provided in a second operation area formed on one side of a first operation area in a Y-axis direction that is a horizontal direction on a carry-in/out side of a processing machine, and configured to load a raw material; a product pallet movable in the Y-axis direction between the first operation area and the second operation area, and configured to collect a product derived from the raw material; and a skeleton pallet movable in the Y-axis direction between a third operation area formed on another side of the first operation area in the Y-axis direction and the second operation area, and configured to collect a skeleton as a scrap from the processing machine; characterized by comprising: a one-piece picking-up mechanism provided above the raw material loading part in the second operation area, and configured to pick up one of the raw materials loaded on the raw material loading part; an endless transfer chain circulatable along the Y-axis direction, and configured to transfer the product pallet in the Y-axis direction between the first operation area and the second operation area and transfer the skeleton pallet in the Y-axis direction between the third operation area and the second operation area; a lifter (76;82) provided in the first operation area or the third operation area, and configured to elevate and lower the product pallet or the skeleton pallet; and a pallet holding member (78; 84) provided in the first operation area or the third operation area, and configured to hold the product pallet or the skeleton pallet above the transfer chain, the carry-in/out system being configured such that when the skeleton pallet is transferred in the Y-axis direction between the third operation area and the second operation area, the product pallet is disengaged from the transfer chain and held above the transfer chain, or such that when the product pallet is transferred in the Y-axis direction between the first operation area and the second operation area, the skeleton pallet is disengaged from the transfer chain and held above the transfer chain. a raw material loading part provided in a second operation area formed on one side of a first operation area in a Y-axis direction that is a horizontal direction on a carry-in/out side of a processing machine, and configured to load a raw material; a product pallet movable in the Y-axis direction between the first operation area and the second operation area, and configured to collect a product derived from the raw material; and a skeleton pallet movable in the Y-axis direction between a third operation area formed on another side of the first operation area in the Y-axis direction and the second operation area, and configured to collect a skeleton as a scrap from the processing machine; characterized by comprising: a one-piece picking-up mechanism provided above the raw material loading part in the second operation area, and configured to pick up one of the raw materials loaded on the raw material loading part; an endless transfer chain circulatable along the Y-axis direction, and configured to transfer the product pallet in the Y-axis direction between the first operation area and the second operation area and transfer the skeleton pallet in the Y-axis direction between the third operation area and the second operation area; a lifter (76;82) provided in the first operation area or the third operation area, and configured to elevate and lower the product pallet or the skeleton pallet; and a pallet holding member (78; 84) provided in the first operation area or the third operation area, and configured to hold the product pallet or the skeleton pallet above the transfer chain, the carry-in/out system being configured such that when the skeleton pallet is transferred in the Y-axis direction between the third operation area and the second operation area, the product pallet is disengaged from the transfer chain and held above the transfer chain, or such that when the product pallet is transferred in the Y-axis direction between the first operation area and the second operation area, the skeleton pallet is disengaged from the transfer chain and held above the transfer chain. a one-piece picking-up mechanism provided above the raw material loading part in the second operation area, and configured to pick up one of the raw materials loaded on the raw material loading part; an endless transfer chain circulatable along the Y-axis direction, and configured to transfer the product pallet in the Y-axis direction between the first operation area and the second operation area and transfer the skeleton pallet in the Y-axis direction between the third operation area and the second operation area; a lifter (76;82) provided in the first operation area or the third operation area, and configured to elevate and lower the product pallet or the skeleton pallet; and a pallet holding member (78; 84) provided in the first operation area or the third operation area, and configured to hold the product pallet or the skeleton pallet above the transfer chain, the carry-in/out system being configured such that when the skeleton pallet is transferred in the Y-axis direction between the third operation area and the second operation area, the product pallet is disengaged from the transfer chain and held above the transfer chain, or such that when the product pallet is transferred in the Y-axis direction between the first operation area and the second operation area, the skeleton pallet is disengaged from the transfer chain and held above the transfer chain.