Provided are an ion generation device and an air purification device which efficiently diffuse ions into a living space using wind generated by an air blower. Specifically disclosed is an ion generation device wherein in a casing provided with an inflow port through which air can flow in and an outflow port through which the air can flow out, an air duct connecting the inflow port and the outflow port, and an ion generator for emitting ions into the air duct are provided. The casing has an inclined wind guide surface and a mounting surface forming an acute angle with the wind guide surface as outer surfaces, and is provided with the inflow port on the side, on which the distance from the mounting surface is short, of the wind guide surface, provided with a first outflow port on the side, on which the distance from the mounting surface is long, of the wind guide surface, provided with a second outflow port in a casing portion leading from the end of the wind guide surface on the side on which the first outflow port is provided to the mounting surface, and provided with a guide portion for leading part of air going from the inflow port to the second outflow port to the first outflow port within the air duct.Linvention porte sur un dispositif de génération dions et sur un dispositif de purification dair qui diffusent efficacement des ions dans un espace vivant à laide du vent généré par une souffleuse dair. De manière spécifique, linvention porte sur un dispositif de génération dions dans lequel sont prévus, dans un boîtier comportant un orifice de débit entrant à travers lequel de lair peut entrer et un orifice de débit sortant à travers lequel lair peut sortir, un conduit dair reliant lorifice de débit entrant et lorifice du débit sortant, et un générateur dions pour lémission dions dans le conduit dair. Le boîtier a une surface de guidage de vent inclinée et une surface de montage formant un angle aigu avec la surface de guidage de vent en tant que surfaces externes
