To provide a collapsible bicycle that can be folded compactly, is light, and can minimize the folding time and developing time.

The collapsible bicycle having advantages more than those of a conventional collapsible bicycle and the other collapsible bicycles is provided. The size of the collapsible bicycle is 12×25×6 inches (305×635×153 mm), and is more preferable than that of the other collapsible bicycles. The weight is 11 pounds (or 5 kg), and is sufficiently excellent comparing with the weight of 18 pounds of the conventional lightest collapsible bicycle. This weight is about a half of the weight of 22 pounds of a general portable bicycle. The volume of the collapsible bicycle folded up into 1,800 inch2 slightly exceeds 1 feet3. The folding work of the collapsible bicycle can be completed in about 10 seconds, and oppositely the developing time is about 6 seconds. Design of the foldable pedal and handle sufficiently contributes to the folded side face outline.