Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2023	Aug. 17, 2023
Entity Listings [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2023
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2
Document Transition Report	false
Entity File Number	001-41241
Entity Registrant Name	HCM ACQUISITION CORP
Entity Central Index Key	0001845368
Entity Incorporation, State or Country Code	E9
Entity Tax Identification Number	98-1581263
Entity Address, Address Line One	100 First Stamford Place,
Entity Address, Address Line Two	Suite 330
Entity Address, City or Town	Stamford
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06902
City Area Code	203
Local Phone Number	930-2200
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	true
Units [Member]
Entity Listings [Line Items]
Title of 12(b) Security	Units, each consisting of one Class A ordinary share and one-half of one Redeemable Warrant
Trading Symbol	HCMAU
Security Exchange Name	NASDAQ
Class A Ordinary Shares [Member]
Entity Listings [Line Items]
Title of 12(b) Security	Class A Ordinary Shares, par value $0.0001 per share
Trading Symbol	HCMA
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		14,066,906
Redeemable Warrants [Member]
Entity Listings [Line Items]
Title of 12(b) Security	Redeemable Warrants, each whole warrant exercisable for one Class A ordinary share at a price of $11.50 per share
Trading Symbol	HCMAW
Security Exchange Name	NASDAQ
Class B Ordinary Shares [Member]
Entity Listings [Line Items]
Entity Common Stock, Shares Outstanding		75,000