A heat transfer plate and a plate heat exchanger are provided. The heat transfer plate includes an edge portion extending along an edge of the heat transfer plate and being corrugated so as to include alternately arranged ridges and valleys as seen from a first side of the heat transfer plate. The ridges and valleys extend perpendicularly to the edge of the heat transfer plate, a first one of the ridges having a top portion extending in a top portion plane, and a first one of the valleys, which is adjacent to the first ridge, having a bottom portion extending in a bottom portion plane. The top portion of the first ridge and the bottom portion of the first valley are connected by a main flank and end, just like the main flank, at an end distance from the edge of the heat transfer plate. The heat transfer plate is characterized in that a slope of the main flank in relation to the bottom portion plane as seen from the bottom portion of the first valley is varying between a minimum slope and a maximum slope along the top portion of the first ridge and the bottom portion of the first valley.