All the injuries took place in Koshigaya in Saitama Prefrecture, the hardest hit area, The Asahi Shimbun reported.
Very strong winds pummeled Koshigaya at around 2 p.m., officials said, then struck nearby Noda in Chiba Prefecture about 20 minutes later.
The storm caused houses to collapse, roofs to tear off, windowpanes to break, utility poles to topple and vehicles to overturn in Koshigaya, firefighters said.
In Noda, roofs were blown off and a storehouse was destroyed, but no injuries were reported.
The Japan Meteorological Agency said it would dispatch officials to investigate and survey the damage.
Some 31,500 households were without power in Saitama, Chiba and Ibaraki prefectures Monday afternoon, The Asahi Shimbun said.
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