The invention relates to a magnet assembly for a solenoid valve, comprising a magnetic core (3), composed of at least two core elements (1, 2), and a magnetic coil (4), said magnetic core being connected in an annular recess (5) of a core element (1). According to the invention, the recess (5) on the side of a terminal surface (6) which forms the core element (1), is closed in a media-tight manner via a web portion (7). The invention further relates to a solenoid valve comprising such a magnet assembly.