How to make an origami Opening Umbrellaかさ（ひらく）Opening Umbrella
Fold the waterbomb base, then open the four panels at the end to make a 3D umbrella.
- 8 steps
- about 8 min
- 1 sheet of origami paper
- Age 7+
8
How to fold
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白い面を上にして、2本のななめの線で、折りすじをつける
Start with the white side up. Fold in half on both diagonals and unfold.
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うらがえす
Turn it over.
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横半分に折って、折りすじをつける
Fold in half from top to bottom and unfold.
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折りすじにそって、左右を内がわへ入れながら、三角にたたむ（ふうせんの基本形）
Bring the sides in along the creases and collapse into a triangle. This is the waterbomb base.
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てっぺんの先を、うしろへ少し折る
Fold the very top point behind a little.
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たてのまん中で半分に折って、折りすじをつける
Fold in half down the middle and unfold.
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前と うしろの はねを、そっと開いて、かさの形にする
Gently open the front and back panels to shape the umbrella.
下から見ると、白い うらがわが 見えます。
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できあがり！もち手と、上の先をかいたら、かさのできあがり！ あじさいや かたつむりと いっしょに かざろう。
Finished! Draw the handle and the tip, and your umbrella is finished! Display it with a hydrangea or a snail.
かさの ふちが まるくなります。Fun fact
日本の「わがさ（和がさ）」は、竹のほねに 紙をはって、油をぬって 水をはじくように作られています。
A traditional Japanese umbrella (wagasa) is made of paper on bamboo ribs. The paper is coated with oil so it keeps the rain out.
Origami English in this model
❓ FAQ
- What age is this origami Opening Umbrella for?
- About Age 7+. It is rated “Medium” (level 3 of 5), with 8 steps, and takes about 8 minutes.
- What paper do I need?
- One sheet of square origami paper (15 cm / 6 in). No scissors or glue are needed.
- What is it called in Japanese?
- In Japanese it is “かさ（ひらく）” (開く傘). The word origami (折り紙) itself means “folding paper”: ori = fold, kami = paper.
- Can I print the instructions?
- Yes. “Print the diagram” puts every step on one page (or a PDF), and the practice sheet has the crease lines printed on the paper. Free for home and classroom use.
