An elevation apparatus provided in a longitudinal direction set in a vertical direction, comprising: a housing that has a side wall in a longitudinal direction and that has an opening in a lower face; a reel rotating to wind a reel wire, wherein the reel wire is wound on the reel to elevate a to-be-lifted object attached to a tip end of the reel wire, and the to-be-lifted object is suspended from the lower side of the elevation apparatus, wherein the to-be-lifted object includes a first light emitting element; characterized by a controller for calculating a travel distance along which the to-be-lifted object is elevated; and a reset switch provided in the housing, wherein the to-be-lifted object is lifted to depress the reset switch and the depression of the reset switch allows the controller to initialize the calculated travel distance, wherein the elevation apparatus further includes: a rotary encoder that is provided in the housing and that detects the rotation amount of the reel by a light receiving element detecting light from a second light emitting element through the slits of a cord wheel; and an anti-misdetection member provided between the rotary encoder and the to-be-lifted object, the anti-misdetection member including a face having a larger area than a slit face of the cord wheel having the slits, the face of the anti-misdetection member being provided at a lower part to be parallel with the slit face of the cord wheel, thereby avoiding misdetection caused by light from the first light emitting element. a housing that has a side wall in a longitudinal direction and that has an opening in a lower face; a reel rotating to wind a reel wire, wherein the reel wire is wound on the reel to elevate a to-be-lifted object attached to a tip end of the reel wire, and the to-be-lifted object is suspended from the lower side of the elevation apparatus, wherein the to-be-lifted object includes a first light emitting element; characterized by a controller for calculating a travel distance along which the to-be-lifted object is elevated; and a reset switch provided in the housing, wherein the to-be-lifted object is lifted to depress the reset switch and the depression of the reset switch allows the controller to initialize the calculated travel distance, wherein the elevation apparatus further includes: a rotary encoder that is provided in the housing and that detects the rotation amount of the reel by a light receiving element detecting light from a second light emitting element through the slits of a cord wheel; and an anti-misdetection member provided between the rotary encoder and the to-be-lifted object, the anti-misdetection member including a face having a larger area than a slit face of the cord wheel having the slits, the face of the anti-misdetection member being provided at a lower part to be parallel with the slit face of the cord wheel, thereby avoiding misdetection caused by light from the first light emitting element. a rotary encoder that is provided in the housing and that detects the rotation amount of the reel by a light receiving element detecting light from a second light emitting element through the slits of a cord wheel; and an anti-misdetection member provided between the rotary encoder and the to-be-lifted object, the anti-misdetection member including a face having a larger area than a slit face of the cord wheel having the slits, the face of the anti-misdetection member being provided at a lower part to be parallel with the slit face of the cord wheel, thereby avoiding misdetection caused by light from the first light emitting element.