A tray-type component supply device comprising: an exchanging table configured to be lifted and lowered between an upper position and a lower position, the exchanging table being further configured to receive a tray (Tp) on its upper surface from a tray supply mechanism in the upper position and to deliver the tray (Tp) in a delivery position; a conveyance section configured to receive the tray (Tp) from the exchanging table in the delivery position and convey the tray (Tp) to a predetermined supply position; a driving section configured to drive the exchanging table to be lifted and lowered; at least one of an upper detection sensor configured to detect the exchanging table in the upper position constituting a retraction position and a lower detection sensor configured to detect the exchanging table in the lower position constituting a retraction position; and a control section configured to obtain a detection signal from at least one of the upper detection sensor and the lower detection sensor and cause the driving section to bring the exchanging table into operation, wherein in a normal state, the exchanging table is configured to reciprocate between the upper position and the lower position without stopping at halfway positions therebetween, and the control section further comprises: an abnormality detecting section configured to detect an abnormal state in which a height position of the exchanging table becomes unidentified, when an operating amount of the exchanging table is insufficient, whereby the exchanging table does not reach the upper position or the lower position; a retraction operating section configured to cause the exchanging table to move to the retraction position at a low speed, being slower than a lifting and lowering speed in the normal state, when the abnormal state is detected, wherein the retraction position is a position where the safety is ensured, and the upper position or the lower position is selectively set as the retraction position; and a calibration and restoration section configured to calibrate the exchanging table for the height position and restore the height position to a normal state, wherein the calibration and restoration section is configured to calibrate the height position of the exchanging table after the exchanging table has operated to the retraction position. an exchanging table configured to be lifted and lowered between an upper position and a lower position, the exchanging table being further configured to receive a tray (Tp) on its upper surface from a tray supply mechanism in the upper position and to deliver the tray (Tp) in a delivery position; a conveyance section configured to receive the tray (Tp) from the exchanging table in the delivery position and convey the tray (Tp) to a predetermined supply position; a driving section configured to drive the exchanging table to be lifted and lowered; at least one of an upper detection sensor configured to detect the exchanging table in the upper position constituting a retraction position and a lower detection sensor configured to detect the exchanging table in the lower position constituting a retraction position; and a control section configured to obtain a detection signal from at least one of the upper detection sensor and the lower detection sensor and cause the driving section to bring the exchanging table into operation, wherein in a normal state, the exchanging table is configured to reciprocate between the upper position and the lower position without stopping at halfway positions therebetween, and the control section further comprises: an abnormality detecting section configured to detect an abnormal state in which a height position of the exchanging table becomes unidentified, when an operating amount of the exchanging table is insufficient, whereby the exchanging table does not reach the upper position or the lower position; a retraction operating section configured to cause the exchanging table to move to the retraction position at a low speed, being slower than a lifting and lowering speed in the normal state, when the abnormal state is detected, wherein the retraction position is a position where the safety is ensured, and the upper position or the lower position is selectively set as the retraction position; and a calibration and restoration section configured to calibrate the exchanging table for the height position and restore the height position to a normal state, wherein the calibration and restoration section is configured to calibrate the height position of the exchanging table after the exchanging table has operated to the retraction position. an abnormality detecting section configured to detect an abnormal state in which a height position of the exchanging table becomes unidentified, when an operating amount of the exchanging table is insufficient, whereby the exchanging table does not reach the upper position or the lower position; a retraction operating section configured to cause the exchanging table to move to the retraction position at a low speed, being slower than a lifting and lowering speed in the normal state, when the abnormal state is detected, wherein the retraction position is a position where the safety is ensured, and the upper position or the lower position is selectively set as the retraction position; and a calibration and restoration section configured to calibrate the exchanging table for the height position and restore the height position to a normal state, wherein the calibration and restoration section is configured to calibrate the height position of the exchanging table after the exchanging table has operated to the retraction position.