A device (10; 20; 30; 50; 60; 70; 80; 90) for detecting an object region (12; 12'; 54; 62; 62'; 72; 72'; 72"), comprising: a flat casing comprising a first main surface, a second main surface opposite thereto and an edge surface arranged between the first main surface and the second main surface; and a multi-aperture device (22; 34; 21; 21' 39; 39'; 39"; 56) comprising: a plurality of optical channels (24a-i) arranged next to one another laterally substantially parallel to the first or second main surface and facing the edge surface in a lateral course, wherein each optical channel (24a-i) is configured to detect a respective subregion (26a; 26b; 26'a; 26'b; 38a; 38b; 44a; 44b; 38'a; 38'b) of the object region (12; 12'; 54; 62; 62'; 72; 72'; 72") through the edge surface or along an optical axis (32a; 32b; 32'a; 32'b; 32"a; 32"b; 37a-d; 37'a-d; 35a-d) of the respective optical channel (24a-i) which is redirected between the lateral course facing the edge surface within the casing and a non-lateral course outside the casing which is modified in relation thereto, wherein the subregions (26a; 26b; 26'a; 26'b; 38a; 38b; 44a; 44b; 38'a; 38'b) of the optical channels (24a-i) cover the object region (12; 12'; 54; 62; 62'; 72; 72'; 72"); wherein the total number of optical channels is arranged laterally adjacent to each other in a single line; and wherein the device comprises a ray-redirecting element (28; 40; 64) which is configured to redirect the optical axes (32a; 32b; 32'a; 32'b; 32"a; 32"b; 37a-d; 37'a-d; 35a-d) of the plurality of optical channels (24a-i) in a reflective manner between the lateral course and the non-lateral course. a flat casing comprising a first main surface, a second main surface opposite thereto and an edge surface arranged between the first main surface and the second main surface; and a multi-aperture device (22; 34; 21; 21' 39; 39'; 39"; 56) comprising: a plurality of optical channels (24a-i) arranged next to one another laterally substantially parallel to the first or second main surface and facing the edge surface in a lateral course, wherein each optical channel (24a-i) is configured to detect a respective subregion (26a; 26b; 26'a; 26'b; 38a; 38b; 44a; 44b; 38'a; 38'b) of the object region (12; 12'; 54; 62; 62'; 72; 72'; 72") through the edge surface or along an optical axis (32a; 32b; 32'a; 32'b; 32"a; 32"b; 37a-d; 37'a-d; 35a-d) of the respective optical channel (24a-i) which is redirected between the lateral course facing the edge surface within the casing and a non-lateral course outside the casing which is modified in relation thereto, wherein the subregions (26a; 26b; 26'a; 26'b; 38a; 38b; 44a; 44b; 38'a; 38'b) of the optical channels (24a-i) cover the object region (12; 12'; 54; 62; 62'; 72; 72'; 72"); wherein the total number of optical channels is arranged laterally adjacent to each other in a single line; and wherein the device comprises a ray-redirecting element (28; 40; 64) which is configured to redirect the optical axes (32a; 32b; 32'a; 32'b; 32"a; 32"b; 37a-d; 37'a-d; 35a-d) of the plurality of optical channels (24a-i) in a reflective manner between the lateral course and the non-lateral course. a plurality of optical channels (24a-i) arranged next to one another laterally substantially parallel to the first or second main surface and facing the edge surface in a lateral course, wherein each optical channel (24a-i) is configured to detect a respective subregion (26a; 26b; 26'a; 26'b; 38a; 38b; 44a; 44b; 38'a; 38'b) of the object region (12; 12'; 54; 62; 62'; 72; 72'; 72") through the edge surface or along an optical axis (32a; 32b; 32'a; 32'b; 32"a; 32"b; 37a-d; 37'a-d; 35a-d) of the respective optical channel (24a-i) which is redirected between the lateral course facing the edge surface within the casing and a non-lateral course outside the casing which is modified in relation thereto, wherein the subregions (26a; 26b; 26'a; 26'b; 38a; 38b; 44a; 44b; 38'a; 38'b) of the optical channels (24a-i) cover the object region (12; 12'; 54; 62; 62'; 72; 72'; 72"); wherein the total number of optical channels is arranged laterally adjacent to each other in a single line; and wherein the device comprises a ray-redirecting element (28; 40; 64) which is configured to redirect the optical axes (32a; 32b; 32'a; 32'b; 32"a; 32"b; 37a-d; 37'a-d; 35a-d) of the plurality of optical channels (24a-i) in a reflective manner between the lateral course and the non-lateral course.