[Problem] To provide a negative photosensitive siloxane compound which can be inorganically developed, and a method for forming a cured film using the compound. [Solution] A negative photosensitive siloxane composition comprising: polysiloxane; a silicon-containing compound having ureide bonds; a polymerization initiator; and a solvent. A cured film can be obtained by applying the composition to the top of a substrate, exposing same, and, without heating after the exposure, developing same.