The charity claims sufferers' families are left to shoulder two-thirds of the £26bn a year that dementia costs the country.
Spokesperson Gale Willis said: "When we spoke to carers they said they didn't feel they were getting enough support.
"They felt they were left to struggle alone and they also had not only the emotional impact of caring for someone living with dementia but the huge economic impact as well."
Richard Norton is the founder of Siloam Christian Ministries and cared for his wife while she suffered from dementia for nine years.
Due to her young age he received financial support but says if he hadn't he wouldn't have been able to cope.
He's now calling for more support for carers and told Premier's News Hour: "Mental health has always been the Cinderella of the health service.
"Because people are old and frail they have very few people who can champion their cause."
New research by the Alzheimer's Society shows the number of those affected by dementia is soaring.
By May next year there will be 850,000 people living with the condition and if trends continue the number is expected to bypass two million by 2051.
Listen to Richard Norton airing his views on Premier's News Hour here: