Tracheostoma valve

Tracheostoma valve comprising a main air passage structure provided with a main valve arrangement, wherein the tracheostoma valve is switchable in response to a spurt of inhalation air from a breathing condition, in which the main valve arrangement is in an open position allowing air inhalation and exhalation via the main air passage structure, into a speaking condition, in which the main valve arrangement is in a closed position preventing at least air exhalation via the main air passage structure, while the tracheostoma valve is switchable in response to a spurt of exhalation air from said speaking condition into said breathing condition, wherein the main valve arrangement comprises an at least partly flexible bistable wall portion which has a circumferential bordering edge, wherein at least part of the circumferential bordering edge forms a hinge around which the bistable wall portion is hingeable between a first stable position in which said closed position of the main valve arrangement is attained in that an orifice of the main air passage structure is being blocked, and a second stable position in which said open position of the main valve arrangement is attained in that said orifice is released.