A building panel, such as a floor panel or wall panel, has a first mechanical locking device at a respective first edge 11 and an opposite second edge, such as long edges, for horizontal and vertical locking of similar or essentially identical building panels in an assembled position. The building panel further has a second mechanical locking device at a respective third edge and an opposite fourth edge for horizontal and vertical locking of similar building panels or essentially identical building panels in an assembled position. The first mechanical locking device includes, at the first edge, a tongue groove 111 configured to receive a first locking tongue at the second edge.