Cover - shares	3 Months Ended
	Mar. 31, 2024	May 09, 2024
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Amendment Flag	false
Document Period End Date	Mar. 31, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Entity Information [Line Items]
Entity Registrant Name	ASPAC II Acquisition Corp.
Entity Central Index Key	0001876716
Entity File Number	001-41372
Entity Tax Identification Number	00-0000000
Entity Incorporation, State or Country Code	D8
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Shell Company	true
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Contact Personnel [Line Items]
Entity Address, Address Line One	289 Beach Road
Entity Address, Address Line Two	#03-01
Entity Address, City or Town	Singapore
Entity Address, Country	SG
Entity Address, Postal Zip Code	199552
Entity Phone Fax Numbers [Line Items]
City Area Code	(65)
Local Phone Number	6818 5796
Units, each consisting of one Class A ordinary share, with no par value, one-half of one redeemable warrant and one right to receive one-tenth of one Class A ordinary share
Entity Listings [Line Items]
Title of 12(b) Security	Units, each consisting of one Class A ordinary share, with no par value, one-half of one redeemable warrant and one right to receive one-tenth
Trading Symbol	ASCBU
Security Exchange Name	NASDAQ
Class A ordinary shares, no par value, included as part of the units
Entity Listings [Line Items]
Title of 12(b) Security	Class A ordinary shares, no par value, included as part of the units
Trading Symbol	ASCB
Security Exchange Name	NASDAQ
Redeemable warrants, each whole warrant exercisable for one Class A ordinary share, included as part of the units
Entity Listings [Line Items]
Title of 12(b) Security	Redeemable warrants, each whole warrant exercisable for one Class A ordinary share, included as part of the units
Trading Symbol	ASCBW
Security Exchange Name	NASDAQ
Rights, each Right to receive one-tenth (1/10) of one Class A ordinary share included as part of the units
Entity Listings [Line Items]
Title of 12(b) Security	Rights, each Right to receive one-tenth (1/10) of one Class A ordinary share included as part of the units
Trading Symbol	ASCBR
Security Exchange Name	NASDAQ
Class A Ordinary Shares
Entity Listings [Line Items]
Entity Common Stock, Shares Outstanding		7,196,395
Class B Ordinary Shares
Entity Listings [Line Items]
Entity Common Stock, Shares Outstanding		100,000