I posted an answer about how to add a BaseLayer as Rasterlayer some weeks ago: High resolution, printable alternative to OpenLayers plugin for QGIS? .
What I described there can also be used for HERE-Layers.
As user Mapperz already mentioned you need an app_id and app_code to use Here-Tiles.
You will get these credentials here: https://developer.here.com/rest-apis/documentation/enterprise-map-tile/common/credentials.html .
You should also have a look at the terms of use if there are legal restrictions about how the tiles can be used or requested.
To load the HERE-Baselayer in QGIS you can use the GDAL minidriver.
Here's the XML-Code:
<GDAL_WMS>
<Service name="TMS">
<ServerUrl>http://1.base.maps.api.here.com/maptile/2.1/maptile/newest/normal.day/${z}/${x}/${y}/256/png8?app_id=YOURAPPID&app_code=YOURAPPCODE</ServerUrl>
</Service>
<DataWindow>
<UpperLeftX>-20037508.34</UpperLeftX>
<UpperLeftY>20037508.34</UpperLeftY>
<LowerRightX>20037508.34</LowerRightX>
<LowerRightY>-20037508.34</LowerRightY>
<TileLevel>20</TileLevel>
<TileCountX>1</TileCountX>
<TileCountY>1</TileCountY>
<YOrigin>top</YOrigin>
</DataWindow>
<Projection>EPSG:3857</Projection>
<BlockSizeX>256</BlockSizeX>
<BlockSizeY>256</BlockSizeY>
<BandsCount>3</BandsCount>
<Cache />
</GDAL_WMS>
Just save this as a xml-file (Replace the placeholder YOURAPPID and YOURAPPCODE) and open it with the "add Raster Layer" button:

This works for a bunch of different layertypes, just have a look at this for further information: https://developer.here.com/rest-apis/documentation/enterprise-map-tile/topics/examples.html
Here some screenshots:
"Here Normal Day":

"Here Traffic" with the up to date traffic information:

EDIT 1: Added another Option: Tile-Layer-Plugin:
If you use the TileLayer-Plugin you can even store your userdefined tile-layer-settings:
Install the plugin:

You will need to use a textfile where you store your userdefined Layers. lets call it "tile_layer_plugin.tsv".
The content can look like this:
#title credit serviceUrl yOriginTop zmin zmax xmin ymin xmax ymax
here Normal Day © Here Nokia http://1.base.maps.api.here.com/maptile/2.1/maptile/newest/normal.day/{z}/{x}/{y}/256/png8?app_id=YOUR_APP_ID&app_code=YOUR_APP_CODE 1 0 20
here Traffic © Here Nokia http://1.traffic.maps.api.here.com/maptile/2.1/traffictile/newest/normal.day/{z}/{x}/{y}/256/png8?app_id=YOUR_APP_ID&app_code=YOUR_APP_CODE 1 0 20
here Aerial Terrain © Here Nokia http://1.aerial.maps.api.here.com/maptile/2.1/maptile/newest/terrain.day/{z}/{x}/{y}/256/png8?app_id=YOUR_APP_ID&app_code=YOUR_APP_CODE 1 0 20
here Aerial Satellite © Here Nokia http://2.aerial.maps.cit.api.here.com/maptile/2.1/maptile/newest/satellite.day/{z}/{x}/{y}/256/png8?app_id=YOUR_APP_ID&app_code=YOUR_APP_CODE 1 0 20
here Aerial Hybrid © Here Nokia http://2.aerial.maps.cit.api.here.com/maptile/2.1/maptile/newest/hybrid.day/{z}/{x}/{y}/256/png8?app_id=YOUR_APP_ID&app_code=YOUR_APP_CODE 1 0 20
IMPORTANT: Use TAB as delimiter!

Replace the placeholders YOUR_APP_ID and YOUR_APP_CODE with your app-id and your app-code and save the file into a folder that you will use for this plugin.
Open the TileLayerPlugin ( You will find the Plugin in the "Web"-Menu) and click on "Settings". Point to the folder where you saved your textfile:

Then you can just open the plugin whenever you need these baselayers and add them with one click:
