A well plate comprises a plate main body and at least one cavity in an upper side of the plate main body. An upwardly open annular channel is formed in the at least one cavity, the annular channel being delimited at an inner circumference thereof by a closed circumferential wall. A horizontal outer circumference of the circumferential wall decreases from bottom to top up to an upper edge of the circumferential wall. Within the horizontal circumference of the circumferential wall, at its upper edge, at least two retaining elements connect upwardly to the upper edge of the circumferential wall. The at least two retaining elements are at a free horizontal distance to one another, and at least one of the at least two retaining elements is elastically supported at the plate main body in horizontal direction.