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Gas flows in porous medja appear in various rcgions ofengineering ， e ． g ． ， calalytic converters and 釦 el cells ． ln order to improve pe面 ance ofsuch devices ， it is important to understand transport phenomena in porous media ， In porous media with pores as small as a molecular rnean free path ， we need to consjder molecular motions directly instead oftreating gas flow as continuum and we also neeCl to consider effects ofcomplicated channels ． Therefc ) re ， the direct simulation Monte Carlo ( DSMC ) method is suitable to solve 甑 nspon phenomena in porous media ， We considered gas flows driven by pressure gradient in porous media imitated by locating nano − scale spheres randomly ， and performed numerical simulations of gas flow without any surface reaction to clarify transport phenomena in porous media ． We investigated effects ofpressure gradien ちdiameter ofspheres ， and porosity on gas flow rate．