A blade holder device for supporting and immobilizing blades when replacing or assembling a pair of blades on a lawnmower. The blade holder device includes an X-shaped frame having a first elongated support pivotally secured to a second elongated support. The elongated supports have an aperture disposed in the center thereof in order to receive a fastener therethrough. Each elongated support further includes a first and second pair of segments permanently attached to the ends thereof. The pair of segments include a recessed area therebetween in order to receive a portion of a blade therein. The device is removably attached directly to the underside of the deck of a riding lawnmower. The device can be placed over a pair of blades to prevent injury of an individual removing or assembling the blades and to prevent damage to the blades themselves.
