A method for manufacturing glass panel unit, comprising: an assembling step of preparing a temporary assembly including: a first glass substrate; a second glass substrate placed opposite the first glass substrate; a frame placed between the first glass substrate and the second glass substrate to hermetically bond the first glass substrate and the second glass substrate to each other; an inside space enclosed by the first glass substrate, the second glass substrate, and the frame; a partition dividing the inside space into a first space and a second space; a gas passage interconnecting the first space and the second space; an outlet interconnecting the second space and an outside space; and a gas adsorbent including a getter; a hermetically enclosing step of obtaining a completed assembly by: converting the first space into an evacuated space by evacuating the first space through the gas passage, the second space, and the outlet and changing a shape of the partition to close the gas passage to form a separator so that part of the frame corresponding to the evacuated space and the separator constitute a seal hermetically bonding the first glass substrate and the second glass substrate so as to enclose the evacuated space; and a removing step of removing part including the second space from the completed assembly to obtain a glass panel unit which is a predetermined part including the evacuated space, wherein: in the hermetically enclosing step, the first space is evacuated through the gas passage, the second space, and the outlet at an evacuation temperature; and the evacuation temperature is higher than an activation temperature of the getter. an assembling step of preparing a temporary assembly including: a first glass substrate; a second glass substrate placed opposite the first glass substrate; a frame placed between the first glass substrate and the second glass substrate to hermetically bond the first glass substrate and the second glass substrate to each other; an inside space enclosed by the first glass substrate, the second glass substrate, and the frame; a partition dividing the inside space into a first space and a second space; a gas passage interconnecting the first space and the second space; an outlet interconnecting the second space and an outside space; and a gas adsorbent including a getter; a first glass substrate; a second glass substrate placed opposite the first glass substrate; a frame placed between the first glass substrate and the second glass substrate to hermetically bond the first glass substrate and the second glass substrate to each other; an inside space enclosed by the first glass substrate, the second glass substrate, and the frame; a partition dividing the inside space into a first space and a second space; a gas passage interconnecting the first space and the second space; an outlet interconnecting the second space and an outside space; and a gas adsorbent including a getter; a hermetically enclosing step of obtaining a completed assembly by: converting the first space into an evacuated space by evacuating the first space through the gas passage, the second space, and the outlet and changing a shape of the partition to close the gas passage to form a separator so that part of the frame corresponding to the evacuated space and the separator constitute a seal hermetically bonding the first glass substrate and the second glass substrate so as to enclose the evacuated space; and a removing step of removing part including the second space from the completed assembly to obtain a glass panel unit which is a predetermined part including the evacuated space, wherein: in the hermetically enclosing step, the first space is evacuated through the gas passage, the second space, and the outlet at an evacuation temperature; and the evacuation temperature is higher than an activation temperature of the getter. in the hermetically enclosing step, the first space is evacuated through the gas passage, the second space, and the outlet at an evacuation temperature; and the evacuation temperature is higher than an activation temperature of the getter.