A bed guard assembly includes a number of end panels, flexible connecting material for placement beneath a mattress, and connection pieces. The connection pieces connect the flexible connecting material to the end panels such that at least one end panel opposes another end panel when the flexible connecting material is disposed beneath a mattress. The end panel includes a rigid frame, a substantially horizontal rigid segment spanning an interior of the outer frame, and a fabric cover. The connection pieces are adjustable, and include a mechanism for pulling taut the connecting material.