A miniature gas transportation device, comprising: a gas outlet plate comprising a gas outlet pipe, a gas outlet hole and plural protrusion structures, wherein the gas outlet pipe is disposed on a first surface of the gas outlet plate, and the gas outlet hole is formed in the gas outlet pipe and runs through the gas outlet plate to output a gas from the miniature gas transportation device, wherein the plural protrusion structures are disposed on a second surface of the gas outlet plate, and a space between every two adjacent protrusion structures of the plural protrusion structures is defined as a vent portion; a resonance plate comprising a central aperture corresponding to the gas outlet hole of the gas outlet plate; a piezoelectric actuator corresponding to the resonance plate; and a covering member comprising a bottom plate, wherein the gas outlet plate, the resonance plate, the piezoelectric actuator and the covering member are stacked on each other sequentially to be positioned, a convergence chamber is formed between the gas outlet plate and the resonance plate, and a first chamber is formed between the covering member and the resonance plate, wherein when the piezoelectric actuator is actuated to perform a gas-collecting operation, the gas is converged into the convergence chamber, transferred to the first chamber through the central aperture of the resonance plate, and temporarily stored in the first chamber, wherein when the piezoelectric actuator is actuated to perform a gas-releasing operation, the gas is transferred from the first chamber to the convergence chamber through the central aperture of the resonance plate and discharged from the gas outlet hole, characterized in that: - a space between every two adjacent protrusion structures of the plural protrusion structures is defined as a vent portion; - the covering member comprises a sidewall protruding from edges of the bottom plate, an accommodation space is defined by the sidewall and the bottom plate collaboratively, and the resonance plate and the piezoelectric actuator are accommodated within the accommodation space, - the device is so configured that when the piezoelectric actuator is actuated to perform the gas-collecting operation, the gas is converged into the convergence chamber through the vent portion. a gas outlet plate comprising a gas outlet pipe, a gas outlet hole and plural protrusion structures, wherein the gas outlet pipe is disposed on a first surface of the gas outlet plate, and the gas outlet hole is formed in the gas outlet pipe and runs through the gas outlet plate to output a gas from the miniature gas transportation device, wherein the plural protrusion structures are disposed on a second surface of the gas outlet plate, and a space between every two adjacent protrusion structures of the plural protrusion structures is defined as a vent portion; a resonance plate comprising a central aperture corresponding to the gas outlet hole of the gas outlet plate; a piezoelectric actuator corresponding to the resonance plate; and a covering member comprising a bottom plate, wherein the gas outlet plate, the resonance plate, the piezoelectric actuator and the covering member are stacked on each other sequentially to be positioned, a convergence chamber is formed between the gas outlet plate and the resonance plate, and a first chamber is formed between the covering member and the resonance plate, wherein when the piezoelectric actuator is actuated to perform a gas-collecting operation, the gas is converged into the convergence chamber, transferred to the first chamber through the central aperture of the resonance plate, and temporarily stored in the first chamber, wherein when the piezoelectric actuator is actuated to perform a gas-releasing operation, the gas is transferred from the first chamber to the convergence chamber through the central aperture of the resonance plate and discharged from the gas outlet hole, characterized in that: - a space between every two adjacent protrusion structures of the plural protrusion structures is defined as a vent portion; - the covering member comprises a sidewall protruding from edges of the bottom plate, an accommodation space is defined by the sidewall and the bottom plate collaboratively, and the resonance plate and the piezoelectric actuator are accommodated within the accommodation space, - the device is so configured that when the piezoelectric actuator is actuated to perform the gas-collecting operation, the gas is converged into the convergence chamber through the vent portion. - a space between every two adjacent protrusion structures of the plural protrusion structures is defined as a vent portion; - the covering member comprises a sidewall protruding from edges of the bottom plate, an accommodation space is defined by the sidewall and the bottom plate collaboratively, and the resonance plate and the piezoelectric actuator are accommodated within the accommodation space, - the device is so configured that when the piezoelectric actuator is actuated to perform the gas-collecting operation, the gas is converged into the convergence chamber through the vent portion.