A coin separating and detecting device comprising a coin separating and feeding device and a coin detecting device and configured to receive coins one by one in a separating concave portion which is formed on an upper surface of a separating and feeding rotating body of the coin separating and feeding device, the coin separating and rotating body being disposed inclinedly and configured to separate the coins, the coin separating and detecting device further being configured to subsequently fed the coins which have been separated from the coin separating and feeding device to a coin detecting device, and the coin detecting device includes a detecting rotating body that is configured to move the coins which have been fed along a detecting portion introduction guide, and a sensor that is configured to acquire physical information on the coins in the step in which the coins are moved along a detection guide following the detecting portion introduction guide, wherein the separating and feeding rotating body and the detecting rotating body are aligned laterally in parallel in the horizontal direction, and the detecting rotating body is configured to receive the coins in the step in which the coins fed from the separating and feeding rotating body fall downwards and is configured to hold the coins, and, thereafter, to deliver the coins onto the detecting portion introduction guide, and afterwards to push the coins forward along the detecting portion introduction guide, characterized in that the coin separating and feeding device is configured to push out the coins which have been separated from the separating concave portion by a moving body which is movable in the radial direction of the separating and feeding rotating body, and the detecting portion introduction guide includes: an arc portion that is curved downward in the direction away from the separating and feeding rotating body and formed with a predetermined radius (r) centered to the center of the axis of the detecting rotating shaft of the detecting rotating body; and a temporary retaining portion which connects the arc portion and the detection guide and is in an arc shape and positioned in a location lower than the arc portion and the detection guide, wherein the detection guide is directed linearly upward, for the sensor, and the detection guide follows the arc portion and is extending linearly upward in the direction away from the separating and feeding rotating body. the coin detecting device includes a detecting rotating body that is configured to move the coins which have been fed along a detecting portion introduction guide, and a sensor that is configured to acquire physical information on the coins in the step in which the coins are moved along a detection guide following the detecting portion introduction guide, wherein the separating and feeding rotating body and the detecting rotating body are aligned laterally in parallel in the horizontal direction, and the detecting rotating body is configured to receive the coins in the step in which the coins fed from the separating and feeding rotating body fall downwards and is configured to hold the coins, and, thereafter, to deliver the coins onto the detecting portion introduction guide, and afterwards to push the coins forward along the detecting portion introduction guide, characterized in that the coin separating and feeding device is configured to push out the coins which have been separated from the separating concave portion by a moving body which is movable in the radial direction of the separating and feeding rotating body, and the detecting portion introduction guide includes: an arc portion that is curved downward in the direction away from the separating and feeding rotating body and formed with a predetermined radius (r) centered to the center of the axis of the detecting rotating shaft of the detecting rotating body; and a temporary retaining portion which connects the arc portion and the detection guide and is in an arc shape and positioned in a location lower than the arc portion and the detection guide, wherein the detection guide is directed linearly upward, for the sensor, and the detection guide follows the arc portion and is extending linearly upward in the direction away from the separating and feeding rotating body. an arc portion that is curved downward in the direction away from the separating and feeding rotating body and formed with a predetermined radius (r) centered to the center of the axis of the detecting rotating shaft of the detecting rotating body; and a temporary retaining portion which connects the arc portion and the detection guide and is in an arc shape and positioned in a location lower than the arc portion and the detection guide, wherein the detection guide is directed linearly upward, for the sensor, and the detection guide follows the arc portion and is extending linearly upward in the direction away from the separating and feeding rotating body.