| 摘要 |
PROBLEM TO BE SOLVED: To further improve heat insulation performance, without largely increasing a dimension along the depth direction.SOLUTION: A sash comprises a first fixing glass pane 211 and a second fixing glass pane 212 joined in a state of securing a heat insulation space 215 between mutual ones by interposing a spacer member 214 in a peripheral edge part, and a third fixing glass pane 213 joined in a state of securing a heat insulation space 217 between the first fixing glass pane 211 and itself by interposing a spacer member 216 in a peripheral edge part in a state of positioning a door tail side end surface on the same plane by forming a rectangular shape of being smaller in outside dimension than the first fixing glass pane 211. While joining rail members 22, 23 and 24 to a surface of the first fixing glass pane 211 in a peripheral edge part of projecting an end surface of the first fixing glass pane 211 to an end surface of the third fixing glass pane 213, a rail member 25 is joined to a surface of the third fixing glass pane 213 in a peripheral edge part coinciding with the end surface of the first fixing glass pane 211. |
