Cleaning sheet and cleaning tool

A cleaning sheet attachable to a cleaning sheet mounting member comprising:

• a central portion which defines a main cleaning area and at least one end portion formed at at least one of both sides of the central portion in a predetermined direction,
• wherein:
• the at least one end portion has a first part having a predetermined first elongation rate and a second part having a predetermined elongation rate higher than the first elongation rate, the second part being disposed between the central portion and the first part in the predetermined direction, wherein the cleaning sheet is detachably held by a cleaning sheet mounting member at a boundary between the first part and the second part;
• and
• the second part is formed by a single sheet element or by a plurality of sheet elements stacked and bonded to each other and the first part is formed by sheet elements stacked in layer and bonded to each other, wherein the number of sheet elements in layer of the first part is larger in number than the number of sheet element(s) of the second part, such that the second elongation rate is higher than the first elongation rate.