Abstract: A baker's oven has an insulated casing arranged into two series of cylindrical compartments, coaxially one above the other, and separated by horizontal heat-insulating decks. A loading door is provided for each compartment, together with top and bottom heating elements. A vertical drive shaft passes coaxially through each series of compartments and a rotary support, for products to be baked, is mounted on the shaft in each compartment. In one or more of the compartments, a pair of vertically spaced rotary supports may be provided on the shaft and an intermediate heating element is provided below the upper of the two supports.