Abstract: An apparatus for casting reinforced concrete modular crypts for use in constructing a substantially monolithic mausoleum edifice. The casting apparatus includes a frame having a plurality of vertically disposed generally U-shaped brackets attached thereto and a plurality of longitudinal members connecting the brackets which support a flexible, shaped sheet metal casting form. The frame is provided with upright sides or doors, at least one of which is hingedly mounted to the frame. A plurality of arm members attached exteriorly to the casting form engage slots or openings in the hingedly mounted door which is forcibly urged into engagement with the edges of the casting form to enclose the form prior to introduction of a fluent casting material. The casting form is sufficiently rigid to support the casting material without deformation, yet sufficiently flexible to permit rapid extraction of the cast element therefrom with no damage to either the form or element.