The invention relates to a plate heat exchanger (1) having a plurality of parallel heat exchanger passages (3) which are separated from one another by separating plates (4). Each heat exchanger passage (3) is delimited on at least one side by an edge strip (8), and each edge strip (8) has a first surface (81) and a second surface (82) facing away from the first surface (81). The two surfaces (81, 82) are soldered to a respective paired separating plate (4). According to the invention, each of the two surfaces (81, 82) has a surface structure (9) with a plurality of uniformly arranged elevations and depressions, and the distance (B) from one elevation to an adjacent elevation (802) or from one depression to an adjacent depression (801) ranges from 0.1 mm to 2.5 mm.
